[Tutorial] Crossflash, Bypass OPID Mismatched Error

[AsItLies]

did you manage to fix it? same issue here.

Sahara errors are very common with qfil because it's older sftware.

1) only use a usb 2.0 port, not 3.x
2) be sure to use a usb data cable, not a charging cable
3) In some cases the problem is Windows, in that it won't let an 'unsigned' driver run. then you have to change windows configuration to allow them.
4) Some have had to try a completely different computer / OS version to get it to work.

good luck

 

[Why So Serious]

Hi guys, first of all thank you for the tutorial, based on it I was able to cross flash my G8X from AT&T android 9 to Europe Android 11. Mane reason to try it was because I seem to have troubles with the Network and as AT&T are kind of excluding 2G decided that this could be causing issues as I wasn’t able to change the network type my only options were LTE/CDMA/USMT. I live in Bulgaria and my previous G6 didn’t have issue and was including also WCDMA/GSM etc, so decided to reflash.



Currently if enter the “hidden menus” I See more options, but can’t really keep it active and in normal setting I’m on GSM/LTE/WCDMA, which in theory I think it should be fine, but still the phone doesn’t ring every time, people get “phone is turned off or out of network” kind of message. Strange thing is sometimes it can ring 6 out of 6 times but other times might not ring. I always get message that someone tried to reach me immediately and can call back. Most times when I’m using the phone for browsing etc doesn’t have issues and it rings, so I’m thinking that it could be “putting the network to sleep” after some time(doubt it but not really knowledgeable in this sphere so trying to find some logic behind it )



Another thing I find strange is that during calls I’m losing all kind of internet 2G/3G/4G in my old phones LTE was dropping but 3G(H/H+) was still active.
Otherwise after crossflash don’t see many issues I get the error for NT-Codes, but overall network is working so not something I worry about. And the other strange thing is that my LG Health is not tracking movement but again nothing that I really care that much about.


So my question is does anyone else have similar issues or suggestions what could be causing it and how can I improve the “network” or anything of that sort.

Thank you )

 

[reachforthesky]

@Why So Serious
I am using a LG G8x flashed from UM to G850QM30b. (A11), runs on Tmobile. Also have 2 more G8x as spare.
From the pictures in your post, I learned 2 things. 1: you have a AT&T unlocked phone, from the first 6 digits in the IMEI, 2 when your phone was on A1 Bulgaria network, the WiFi calling and volte were not Provisioned . The only thing I can think of is that you may not have the right carrier MBN.
You can check the hidden menu for Current MCFG Status. Make sure it says A1 Bulgaria ( I don't know the code for A1, TMO is T-Mobile for myphone). If not, you need to "inject" the right MBN and activate it. Check Wish30's How to add Volte support ....

When I put Tmobile SIM card into the flashed QM30b, for some unknown reasons, TMO MBNwas not loaded. Instead my phone "selected" ROW_ATT as MBN. My T-Mobile phone service was working fine, so I never noticed the error until T-Mobile emailed to warn me that I haven't activated VoLTE on my phone. ( TMobile shut down older networks by May 31). I fixed it by loading a TMO MBN into my phone using Wish30's guide.

 

[olaglam]

Thank you for this tutorial, i want to crossflash my Lg G8x ATT to open can, but before i start , i just want to get this statement by the OP right " first, MAKE A FULL BACKUP OF ALL PARTITIONS; and I mean it!!! at least, for your sake, make a backup of "modemst1, modemst2, fsg, fsc, ftm" partitions, for emergency. is he referring to the step in B 1 "1. Make a backup of and erase these 7 partitions: FTM, Modem_A, Modem_B, SID_A, SID_B, OP_A, OP_B." thanks

 

[AsItLies]

Thank you for this tutorial, i want to crossflash my Lg G8x ATT to open can, but before i start , i just want to get this statement by the OP right " first, MAKE A FULL BACKUP OF ALL PARTITIONS; and I mean it!!! at least, for your sake, make a backup of "modemst1, modemst2, fsg, fsc, ftm" partitions, for emergency. is he referring to the step in B 1 "1. Make a backup of and erase these 7 partitions: FTM, Modem_A, Modem_B, SID_A, SID_B, OP_A, OP_B." thanks

No. Certain partitions serve certain purposes. The 'make a back up and erase' part is for the purpose of crossflashing.

The 'make a full backup or at least these partitions (etc)' serves a different purpose. Those partitions have vital information for your specific device in them, like imei etc. And, it's worth nothing, partitions like ftm are critical to have, as there are usually problems further down the process that can only be remedied by restoring the ORIGINAL ftm partition, that came with the device.

When someone says 'make a full backup', I'd say this, not doing it is at your own peril. There are things farther down the road you may not be aware of now, that you'll learn how important it would have been to have a full back up. The guide doesn't go to the trouble of explaining what all those possibilities are, it just says to make a full back up.

It would be wise to learn from their experience and do it. Or, you can not do it, and probably end up crying later.

 

[olaglam]

No. Certain partitions serve certain purposes. The 'make a back up and erase' part is for the purpose of crossflashing.

The 'make a full backup or at least these partitions (etc)' serves a different purpose. Those partitions have vital information for your specific device in them, like imei etc. And, it's worth nothing, partitions like ftm are critical to have, as there are usually problems further down the process that can only be remedied by restoring the ORIGINAL ftm partition, that came with the device.

When someone says 'make a full backup', I'd say this, not doing it is at your own peril. There are things farther down the road you may not be aware of now, that you'll learn how important it would have been to have a full back up. The guide doesn't go to the trouble of explaining what all those possibilities are, it just says to make a full back up.

It would be wise to learn from their experience and do it. Or, you can not do it, and probably end up crying later.

Thanks for the reply, I am a complete begginer at this, that why my question sounds dumb, is this something I can do with the QFIL, or do I need another tool

 

[AsItLies]

Thanks for the reply, I am a complete begginer at this, that why my question sounds dumb, is this something I can do with the QFIL, or do I need another tool

Not a dumb question, but learn from others, if they say full backup, just do it.

Follow this thread for a guide using qfil qhloader to backup a g8, should be much the same as a v40.

Another option would be to use bkerler edl utilities. Search google for that and you'll find his git page. On that page there's an iso you can flash and it will be a bootable linux with all the utilities installed.

Ea option is a bit daunting, but once completed, you'll have an entire backup of the device, and in the case with at&t, which doesn't make it's kdz available, it would be pretty much the only way you could get back to oem full stock safely.

cheers, good luck

 

[olaglam]

Not a dumb question, but learn from others, if they say full backup, just do it.

Follow this thread for a guide using qfil qhloader to backup a g8, should be much the same as a v40.

Another option would be to use bkerler edl utilities. Search google for that and you'll find his git page. On that page there's an iso you can flash and it will be a bootable linux with all the utilities installed.

Ea option is a bit daunting, but once completed, you'll have an entire backup of the device, and in the case with at&t, which doesn't make it's kdz available, it would be pretty much the only way you could get back to oem full stock safely.

cheers, good luck

Ok thanks will do this

 

[olaglam]

thanks this works

 

[10terryo1]

thank you netmsn and as it lies for your patience and contributions. I am trying to preform this magic trick on my lmg820um 20f. unlocked sprint on att network and software i think. anyways when I go to download mode and open LGUP I get a DLL mismatch error and am infgormed I should update with a MSI file that includes the 820um20f. ive searched and am at aloss as I cannot procure a later version ofLGUP_Common.DLL. and my phone is in download mode as I am sending this. anybody ??!!

 

[olaglam]

i was able to flash open ca to my ATT LG G8x thanks

 

[10terryo1]

update on my last post current rejected software is lm820um21f. which evidently is not in the LG common.dll file and I dont know how to get ahold of a att 21f kdz to pull the lgupc.dll out of it but shjouldnt I be able to pull it with QFIL Partition manager fromwhichever part it is on?

 

[netmsm]

so when i click partition maneger this happens. this is the first time im doing something like this so if there are additional guidelines i should be ffollowing please let me know. do i need xml files? if so where do i get them? my phone is an lg g8 thinq from at&t

Two things, first, remove any space in path and name of the firehose file, second, have the Qfil open before going to EDL mode and be quick to start partition manager as soon as the phone gets into EDL mode.

 

[dalponis]

i was able to flash open ca to my ATT LG G8x thanks

You were able to change the NT code as well? I had no luck getting the NT code fixed on my LG G8(820UM).

Maybe there's something in hidden partitions that prevents NT Code from getting changed. There's one way to make sure about this: You need to flash the phone in "chip erase" mode. But before chip erase create backup. After flashing is completed you need to flash it again to bypass the OPID error.
Then go for flashing vbmeta...
Do not restore ftm and LUN5 partitions until after editing NT Code.

I'm not sure I understand what you're recommending I try. but I took a stab at it

a) Full backup
1) Use LGUP and this guide to flash my phone in "chip erase" mode and with the ca open firmware
2) You'll get OPID error, so follow this guide again and flash the CA open firmware
3) Do newly provided steps by you, (disable-verity steps on vbmeta and dev qfil)
4) Still can't get the NT Code

I'm interested octoplus LG digital edition, I'll see if that can resolve NT code and edit my IMEI.

 

[olaglam]

You were able to change the NT code as well? I had no luck getting the NT code fixed on my LG G8(820UM).




I'm not sure I understand what you're recommending I try.

1) Use LGUP and this guide to flash my phone in "chip erase" mode and with the ca open firmware.
2) You'll get OPID error, so follow this guide again and flash the CA open firmware.

Won't this just put me back at the same state as if nothing has happened?

I am still seeing the NT code error but it's only when I restart my phone, I thought it was the reason i initially had problem with my mobile data connection after crossflashing but that was because of APN settings

 

[netmsm]

I'm interested octoplus LG digital edition, I'll see if that can resolve NT code and edit my IMEI.

I'm sure that Octopus can resolve such issues. It is done through the process of repairing IMEI which costs 100 credits, about 13$ I think!

 

[dalponis]

I'm sure that Octopus can resolve such issues. It is done through the process of repairing IMEI which costs 100 credits, about 13$ I think!

I found out that the only listed Canadian dealer apparently, "doesn't do this in house". So that option is out.

"Just put back on AT&T android 10 and sell the phone" seems like a better idea.

Ha, so I got back on AT&T firmware, I fixed my IMEI again, but apparently the nt CODE with "0" is still invalid. and my phone is perma locked.

 

[10terryo1]

I used key file to delete partitions after vacuum them up booted to download mode and opened LG up LG up says dll mismatch download correct MSI file.I tried every day as hell file I can find as well as making my own and nothing seems to work any ideas. 820 um Sprint on AT& t--

 

[10terryo1]

The first time LG said BLM this match with my particular model number and software number all other times just said cannot load dll all this happened as LGUP was loaded loading of course. All my drivers are correct the best I can tell. I am wondering if AT&t slipped a Mickey on me with the new 21 series software where my phone won't be detected by the 16 series LG up. I've also noticed that the LG website says to use the 17 series LG up. I am lost and I'm sitting here with my phone half empty wondering if I need to restore restore original partitions.

 

[10terryo1]

Pork and spell checker forkin spell checker!!!!