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[Q&A] Lenovo phones / Cybermaus ROM's (A750, A789, P700i, A660)

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By cybermaus, Senior Member on 22nd September 2012, 06:52 AM
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Hi all

I am opening up this Q&A thread as extension to my ROM threads, for the simple reason that ever since there is a limitation preventing new users from posting in development threads, I get flooded with PM's. So I intent to move any Q&A, help requests, as well as free and open discussions between users here.

Since the A750 and A789 are so similar, and I put the same stuff in them, I extent both into this one Q&A thread, and in fact, much of it knowledge applies to other Lenovo's like the P700, P700i, S880, A660 which are again very similar and I even use them as basis of my ROM.

Also, I am not intending to be topic police. Like in my other threads, I do not mind if you guys share knowledge about APKHOT or Smileyvvv or Etotalk ROM. As long as it is helpful. Also, I may not always reply myself, so feel free to help each other.

Link to the original threads:
[ROM][2012.xx.xx] Lenovo A750 custom ROM (GB&ICS). <last page>
[ROM][2012.xx.xx] Lenovo A789,P700i,A660 factory&custom ROM (ICS). <last page>

Other related threads (not all mine):
CWM flashing tutorial (update using recovery)
MT6575 flashing tutorial (update using flash utility
Lenovo Original recovery tutorial
[SCRIPTS] Unpack / repack MT65xx boot.img, recovery.img or logo.bin
[REF] Unpacking and repacking stock rom .img files
[UTIL][APP]Lenovo Security / LeSec app (anti-virus/spam/theft/firewall)
[TOOL][TUT]Backup and Restore Mediatek based phone's IMEI
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22nd September 2012, 06:53 AM |#2  
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How to DIY : Self root/gapps/playstore/locationfix/clean my ROM
This is a guide on how to root & cleanup your China ROM yourself. It will probably work on all ICS China phones. But it requires & starts with the availability of a recovery image for your phone

There are in fact a few steps:
- Get a proper recovery image for your phone.
- Root it by installing Chainfire's root package
- Install Google GMS ('GAPPS') to get Play Store and Localisation to work
And optionally
- Install Mobile UncleToolset
- Install an extra small fix with location services
- Install an extra small fix with latest APN list
- Install an extra fix to remove well known Chinese system apps

Recovery image
The Recovery Image allows you to boot into an alternative small Linux that you can then use to update the main Android. Updates usually come in "" scripted files. And the recovery has some other utilities like backup or wipe the entire phone. Getting a working recovery for your phone is step number one, because if you have a recovery, you can do everything else.

To check if you already have a recovery: Well, try to boot into it. The boot sequence may vary with the phone, but on MediaTek phones it is usually to replace the battery and then press&hold both volume buttons while powering up. I have seen it where you need to actually press the power button a split second before pressing both volume buttons. Try a few times, replacing the battery each time.

If you get to a screen that reads CWMR or CWMR Touch (short for ClockWorkModRecovery), you are all set and can continue with rooting. CWMR it is the most common open recovery image. If your recovery is closed, then you need to search the web for a working recovery for your specific model. Each brand and model needs its own recovery, because screen drivers, buttons and partition tables may differ.

Search the web is the best advise. Search wide and search deep. If you cannot find any recovery, then see if you can find a full ROM for your phone. If you have a working ROM image, then there are people on XDA that can make a recovery for you, but typically you need to show/prove that you have really tried to find one yourself.

Flashing a recovery
If you do find a recovery, that you suspect is the correct one for your ROM, then comes the scary part: Flashing the recovery to the phone.

This paragraph is specific to Mediatek based phones. On different hardware you also need a recovery, and once you have a recovery, you can use the other parts of this post, but how to flash other hardware, I do not know, sorry

Flashing using the flash tool is scary to new users. Because new users suspect that if they mess it up, the phone dies. And this is correct! But if you only flash the recovery.img part, you should be fairly safe. Read this manual on flashing. Getting the USB driver installed is sometimes a bit tricky, you may also want to read post #21 and post #25 for help.

I have seen several people asking 'where to find the scatter file'. Well, it comes with the ROM you want to flash. If your ROM file does not come with a scatter file, then is not a ROM file that can be flashed with the flash utility, but with an open recovery.

Once you have a working recovery, the rest is simple. For rooting, simply install (from inside the recovery) chainfire's "CMW installable ZIP"
Link to his post: (ignore his big red 'requires root' warning). The file you need is labeled "CWM installable ZIP" at the bottom. Direct link to the file you need to install via recovery

This usually works by putting the zip file on the SD card (its name can be anything, though for some limited recoveries it sometimes must be named ''), booting into recovery, and selecting the zip file to update.

Google GMS (Market/Play Store, Location, etc)
Simply install the latest Google Mobile Services (better known as GAPPS) from CyanogenMod V9. This is their explaining wiki from CyanogenMod
The file you need is called for ICS and for JB and can be found here. You probably also want to wipe your cache partition after doing this.

Mobile Uncle toolset
Just install this program apk (so not through the recovery, just install it normally). Or search the web for the latest one.

Fix location services
If location services does not work, do apply Google GMS (GAPPS) above. If it still does not work, it may be because the phone is programmed to use Chinese location services. This patch will tell it to use GMS. The patch will apply, and probably even work, on all ICS phones. But was originally made&tested on a Lenovo A750 ICS. Its called V1.3 because many people have downloaded the A750 v1.3 patch and used it on many MT6575 phones. It is still the same patch, except the is tweaked to work on any ICS phone, not only MT6575 ones.

Sometimes you also need to go into MobileUncle tool, the MTK Engineer mode, and in location settings. Depending on your exact model, somewhere in there is a NetLoc or NetLocation and a GeoCoding setting, with options of MEDIATEK and GOOGLE. Ensure they are set to GOOGLE.

After messing with location settings, it is best to also wipe cache.

Fix APN list (or My 3G does not connect!)
You can always add your own APN (Access Point Names) from the settings menu. Just add your own, and select that over the pre-build one. But this package will update with the latest list as maintained by CyanogenMod 9. The was made in such a way it should work on all ICS phones, Mediatek or other.

Clean well known Chinese system apps
<patch still coming>


List of known recovery images for Mediatek Flash tool:
Lenovo A750 : 592zn : See also this post #607, nandroid backup does not work.
Lenovo A789 : 592zn or APKHOT
Lenovo P700i : My own, based on APKHOT with CWM.
Lenovo P700 : My own, based on CWMT / 592zn. nandroid backup will not work.
Lenovo A660 : My own, based on APKHOT with CWM
Lenovo S560 : My own, based on APKHOT with CWM (as yet untested)

Additional Recovery Images in this post.

If you feel you searched all over the web, and could not find a recovery for your model, and you next feel you should ask me or one of the other people on XDA to make you one (which I am not encouraging), than please be aware we need at least a 'standard ROM' for your phone to start from. Without it, I can do nothing. So go back out there, and find a standard ROM, does not matter what language, as long as it is for your specific phone model and known to work.

Also, as an extra warning : If you are flashing, and you experiment with 'suspicious' ROM sources, *never ever* flash the preloader, mbr, ebr uboot. Only flash those from a trusted source and if they belong to your exact brand and model phone.
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22nd September 2012, 07:02 AM |#3  
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22nd September 2012, 07:05 AM |#4  
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Originally Posted by lolo250612

Hello from France,

Just a little message to thank you very much for your very useful "Lenovo A789 factory&custom ROM (ICS)" thread. I have just bought a A789 from etotalk, and your posts really help to master the beast.

I can't participate to the thread because I am a new member and consequently can't post message to this development thread. And this very sad, because I have discovered a shortcoming of this phone. Apparently, the ICS entire phone encryption does not work and, according to some information I have gathered around the web, it may be due to the fact that the internal sd partition is not ext4 which seems to be required.

It may be due to the fact that the kernel does not support ext4. If this was the case, I would be very pleased to activate the option, recompile it and share the result with other people at xda. I have done it for two types of Samsung Galaxy phones.

In this case, the two problems I would be faced with are:
1) Getting the kernel sources. For Samsung it is quite easy. For Lenovo, I am not able to find them (I can't read Chinese).
2) The process to package the new compiled kernel to a zip, compatible with cwm.

Anyway, thanks for your help and to share your knowledge.



Originally Posted by cybermaus

well, not sure about encryption, but I can *assure* you that the phone supports ext4, because in fact the root; system; cache; secro and data partitions are all in ext4 . I know that quite certain, because to unpack/repack, I need to recreate an ext4 loop device.

Internal SD is indeed FAT partition. But it is normal for SD to be FAT

It is possible the encryption fails on the FAT of the SD card. It is an internal device, if that encryption utility tries to parse all the internal partitions, it may fail on FAT, but I am guessing here. However, then it would fail on pretty much all recent china phones, they all seem to have this internal SD card. You could try to simply format the internal SD as ext4.

I do not think it would fail on the recovery or boot sections. Those are all nicely wrapped up in the first partition of the emmc chip (emmc0p0 or something) in a proprietary filesystem, as I suspect true for all Androids. So your tool would know to exclude that the first one. However, if you want, you can get the original recovery you asked about from the original A789 ROM in my Dev-Host.

Edit: Encryption issue solved, see post#9 below
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22nd September 2012, 10:19 AM |#5  
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I already managed to build a multilang framework-res.apk for the A789 ROM. But now there are all those apps that need to be made multilang also - settings.apk and more... a lot of work.

Is it possible to take a P700 ROM with A750 kernel and flash it to the A750? Or a P700i ROM and A789 kernel for the A789? They seem to be almost identical.
22nd September 2012, 10:45 AM |#6  
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Any plans to integrate the long press home button function in A750_ROW_S114_cybermaus_ICS_V3.1? Would like to test this rom but this missing feature is essentail for me...and onother question: V3.1 is also for A789, right? Same problem with long press home feature?
22nd September 2012, 10:46 AM |#7  
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Well, I am a little disappointed about that question. Putting the P700_ROW on the A750 is *exactly* what my V3 series is. Works wonderful. It's the reason I have been updating this thread for the last two weeks. Problem is that the only extra language is Vietnamese. You may want to re-read posts #2 and #585 in the A750 thread.

I suspect the same is true for P700i and A789, but I did not find a P700i_ROW rom yet. I did find a S880_ROW, and when I have time (later this weekend) I will check if that has proper multilanguage (edit: No. It adds ru, vi, id to en and zh. Not quite what I had hoped for)


Yes. When I know how. But I do not have a clue at this moment. I am very pleased about the V3.1, but the missing long press is annoying me at times.

No, V3.1 is not for A789 (yet). They have different partitions, different schreen driver. YOU CANNOT flash a A750 on A789 (or any MT6575 on MT7577) without 'porting' the ROM. I do have a Frankenstein ROM, using p700_ROW with kernel/partition/modules/baseband from A789. But it was not tried out yet.
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22nd September 2012, 02:44 PM |#8  
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A789: Encryption problem
I have installed aLogcat to determine what could block the encryption service on the different ROMS I have tested on my A789. The interesting part revealed to be:

E/Cryptfs ( 87): Orig filesystem overlaps crypto footer region. Cannot encrypt in place.

Googling for this problem, it appears that there is a strong probability that the culprit is CWMR that I have installed almost right after getting my phone. See: or

So if somebody has a package that can be safely used with mt6575-flashing tools, to recover the stock recovery or, much better, to install a "clean" version of CWMR, I would be glad to test it and see if it is actually the origin of the encryption problem.

@Cybermaus: I have just noticed that you have already addressed part of this message. I have already tried to format the internal sd as ext4 with Minitool partition Wizard on Windows. This fails also. Moreover, the system reports a failure on this partition and ask to reformat it as vfat. I will try by putting back the original recovery from your 4shared. Thanks a lot.
22nd September 2012, 07:56 PM |#9  
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If I read that post you found, the problem is not so much CWMR or CWMRT itself, but the fact it wipes and formats /data completely, without leaving 16KB of unused space at the end of the partition.

That means replacing it with factory recovery will not help, unless if you then also wipe using that factory recovery, and that factory recovery does leave 16KB. You could also try wiping it from the settings menu.

After you have tried the factory , let me know. I think I can make an empty /data for you that is 16KB shorter than the partition, but you would have to apply it using the flash-utility method.

Edit: checking, I found that the userdata.img that is inside the original S228 factory flash ROM is already 1024K short of 768M. So 767M. No need to build one with only 16K short, just use the one you already have.
22nd September 2012, 08:58 PM |#10  
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Hi cybermaus
Thanks for your contribution. Please help me if you've free time.
Does this custom ROM support traditional Chinese character?? I'm sure Chinese support would include simplified Chinese.....
22nd September 2012, 09:13 PM |#11  
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The A750 V1 and A789 V2has two forms of Chinese, which I cannot read, but I suspect are traditional and simplified. The A750 V3 has one form of Chinese, which I still cannot read, so I am not sure which of the two, but here is a screenshot of it, let me know which it is.
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a750, a789, lenovo, mediatek

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