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I want to root my encrypted Asus Transformer TF101 (Firmware 8.6.5.21; Serial B80...) and install a custom ROM. I read that the only way to do this is by downgrading to stock 8.6.5.19 and then using Razorclaw.

I know that using tablet encryption with Custom ROMs is a big no-no, so I will have to wipe my data (factory reset). However I do wish to keep some application Data (such as save games) to which I only have access via root.

So my question is, can I:

  1. Safely(!) downgrade to 8.6.5.19 on my encrypted tablet
  2. root
  3. backup
  4. unencrypt the tablet (factory reset)
  5. install custom ROM

or do I have to:

  1. factory reset (losing all my precious data)
  2. downgrade to 8.6.5.19
  3. root
  4. install custom ROM

Update: I found out that Asus already includes an app which allows to save application data without root (aptly named "App Backup"). So I will go with the second option. I'll leave the question open though as I still don't know if I could have downgraded without doing a factory reset.

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I know some tablets can be upgraded while encrypted, so it would make sense if downgrading was possible also. Is there an "official" method to downgrade, though? –  Matthew Read Jan 23 '12 at 18:10
    
not really, the downgrade itself is a hack of sorts, it gives the old firmware with a higher version number (see first link). The process should be similar to a regular upgrade so I am hoping it works, Id just rather someone who knows confrims it ;-) –  Uli Jan 23 '12 at 18:42
    
Interesting. Speaking personally, I'd risk it. You don't have much of an option unless your current firmware is rootable, right? –  Matthew Read Jan 23 '12 at 18:49
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Well I could go with option 2... I'd rather loose my save games than brick my tablet. –  Uli Jan 23 '12 at 18:54
    
Fair enough. Hopefully you get an answer. –  Matthew Read Jan 23 '12 at 19:12
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1 Answer 1

up vote 0 down vote accepted

I ended up doing a factory reset on my tablet (after doing a backup of my data with "App Backup"). As far as I know the downgrade would probably have worked, but I decided not to risk it.

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