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[Q] Having SBK2 device, what can and can't be done?

9th February 2012, 11:42 AM |#1  
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So, my brand new Transformer came yesterday (From Amazon) and it has an SBK v2 bootloader (sbk detect under mac, serial is BC0KAS), here is what I understood, and ask for questions, after many reading, can you please confirm or correct?

1- SBK v1 can be rooted, put custom roms, return back to stock, unbrick in case something goes wrong with nvflash. [CONFIRMED]

2- SBK v2 can be rooted? (some say B70 can, or is it just B70 with SBK v1?) [CONFIRMED]

3- SBK v2 can have custom roms? (depends on point 2)? [CONFIRMED]

4- SBK v2 cannot have ClockWorkMod? [Wrong, SBKv2 CAN have ClockWorkMod]

5- SBK v2 does NOT support nvflash, so if you softbrick you cannot recover (I am certain of this one, I guess). [CONFIRMED, if you damage ROM & clockworkmod = BRICK]

What can be done then with an SBK v2 device? wait for developers to find the ways to crack it (as sbkv1), or have an nvflash working?

Is there some petition open to tell Asus to unblock the bootloader as they did with the Transformer Prime?

currently (after 1 day), I am already thinking of returning it back.

I know i might be asking a lot of questions, but information is not easily available in 1 thread.

Update:
New question: with SBKv2 is it possible to return back to stock (Stock ROM, unrooted with stock recovery)?

Thanks in advance...
Last edited by mcbyte_it; 9th February 2012 at 12:25 PM. Reason: added an extra question
 
 
9th February 2012, 12:02 PM |#2  
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SBK doesn't keep you from rooting from what I understand, the firmware version does (current 8.6.5.21 has been cracked and can be rooted by nachoroot, or if not can be firmware upgraded to 8.6.6.19 and rooted with razorclaw)

SBK2 simply keeps you from using NVFlash to recover, as far as I know, once you are rooted, you can install CWM recovery on any SBK version.

Just alot of SBK2 owners have not rooted or installed CWM if they did root for fear of losing their recovery (if you bungle the recovery, you may be able to flash your recovery through the ROM, if you mess up your ROM, you can flash another ROM through CWM or stock recovery, BUT if your recovery img is corrupted AND your ROM stops working, SBK1 can flash both via NVFlash, SBK2 is effectively bricked)

EDIT: SBK2 USED to keep you from being able to root when NVFlash was the only method available for rooting and installing superuser and busybox, see here
http://forum.xda-developers.com/arch...t-1347388.html
Last edited by luna_c666; 9th February 2012 at 12:09 PM.
9th February 2012, 02:43 PM |#3  
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I was going to say I will try to NVFlash my device and tell you if it is SBK1 or 2, I assumed it would be SBK2 because it is B70, but lo and behold it was SBK1..I would have been lucky a few months ago before the razorclaw app was developed and SBK2 was rooted, but I didn't get my TF until after that..

So, SBK1 here have gone to stock many times, but cannot confirm the procedure for SBK2 tablets, though I assume it is possible. Thought for sure I was going to be able to come back and say my TF was SBK2 and had been to stock, but nope haha

EDIT: considering you can backup your entire setup via CWM, recovery mage and all, and flash it wthin CWM (like restoring the backup) is evidence to me that you can no doubt unroot an SBK2 as long as you have a working recovery image.
Last edited by luna_c666; 9th February 2012 at 02:47 PM.
9th February 2012, 03:52 PM |#4  
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From what I understand, the first thing to do on a new device is to have root (with the tools you mentioned), once you have this (stock ROM with root), you can install CWM, and with CWM you can install custom and stock roms.

but how can I bring back the standard Stock recovery? when I have stock unrooted ROM I can't flash Recovery partition from the Android itself, and nvflash doesn't work on SBK2. can CWM be used to flash a stock recovery over itself?

Is there any chance that Asus will unlock the TF101 when it releases the tool to unlock the Transformer Prime (in February, as promissed)? in case they both use same blocking technology?
9th February 2012, 04:56 PM |#5  
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Quote:
Originally Posted by mcbyte_it

From what I understand, the first thing to do on a new device is to have root (with the tools you mentioned), once you have this (stock ROM with root), you can install CWM, and with CWM you can install custom and stock roms.

but how can I bring back the standard Stock recovery? when I have stock unrooted ROM I can't flash Recovery partition from the Android itself, and nvflash doesn't work on SBK2. can CWM be used to flash a stock recovery over itself?

Is there any chance that Asus will unlock the TF101 when it releases the tool to unlock the Transformer Prime (in February, as promissed)? in case they both use same blocking technology?

Yes you can flash stock recovery over cwm from within cwm, you have to have the file..i found it and have it on my hard drive, but can't remember where i got it from..the same procedure as going stock on sbk1 tablets

The proof that you can flash recovery while in recovery mode is that you can install higher versions or different developer's versions of recoveries from cwm. Im sure when running cwm it is being read from ram so flashing the recovery partition will only affect your recovery after you reboot (i.e. Can technically go into cwm, flash recovery partition first and then flash stock rom, but i believe packages are available to flash both at once, and there would be no reason to do it in this order, but im pretty sure it could be done)

Somewhere on here is a guide how to return to stock to prepare for the ics update, it should contain the odd bits and links to fill in my sparse knowledge.
Last edited by luna_c666; 9th February 2012 at 05:00 PM.
9th February 2012, 05:11 PM |#6  
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Getting back to stock ROM and recovery
http://theunlockr.com/2011/11/28/how...s-transformer/
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9th February 2012, 05:14 PM |#7  
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That's the one!
8329 recovery.zip.. Btw it should be noted that the recovery image is not region-branded, that should mean it will work with any region, while you will need to make sure to get the region-specific firmware..

And i did the procedure in reverse from that thread, not to confuse, but i:

Placed both files (recovery and firmware) into my sd card root
Booted into cwm and flashed stock recovery, wipe everything before powering down
Rebooted into recovery again and flashed the firmware with stock recovery.

I think it will work either way, i left my rooted rom in place so i could install cwm if the recovery flash failed, i suppose the alternative is leaving your recovery in place in case the stock rom flash fails..i just like knowing on the first reboot whether my first flash was successful and not flashing blind imo.
Last edited by luna_c666; 9th February 2012 at 05:23 PM.
28th February 2012, 02:45 PM |#8  
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Bump.

This post suggest new Transformers can be nvflashed too.
http://forum.xda-developers.com/show....php?t=1518552

Waiting for answer from OP to see what he has to say.

Anyone else got any news?
28th February 2012, 02:51 PM |#9  
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Quote:
Originally Posted by josteink

Bump.

This post suggest new Transformers can be nvflashed too.
http://forum.xda-developers.com/show....php?t=1518552

Waiting for answer from OP to see what he has to say.

Anyone else got any news?

SBK v2 is still not nvflash compatible
28th February 2012, 03:46 PM |#10  
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Quote:
Originally Posted by josteink

Bump.

This post suggest new Transformers can be nvflashed too.
http://forum.xda-developers.com/show....php?t=1518552

Waiting for answer from OP to see what he has to say.

Anyone else got any news?

That thread is full of bad information and garbage. I would forget it exists.
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