I decided to downgrade because I could not achieve root. After the initial OTA JB update was able to restore it using Voodo OTA rootkeeper but after my manual FW update attempt lost & could not achieve root again. After the downgrade, root worked on the 1st try using this method:
_http://www.theandroidsoul.com/easy-guide-root-tf700t-asus-transformer-pad-infinity/
++My downgrade to ICS steps (it may be overkill but worked for me):
1.Backup everything from tablets internal SD (data-photos..etc) (either use an app or drag & drop connected to a computer. Remove external SD card.
2.Do a wipe data:
Start with PowerOn+VolumeDown
Hit VolumeUp to get the 'wipe data' selection.
3.After that, went into tablet (Jelly Bean is still loaded at this point) and did a factory restore. (Settings\backup-reset\factory data reset), after this JB was still loaded.
4. Get the ICS firmware at Asus site link below: search on the page for "V9.4.5.30 Only for US SKU" double-check the SKU for your TF700 in Settings\About\Build number; mine is "US" there's US\TW\WW to choose from.
_http://support.asus.com/Download.aspx?SLanguage=en&m=ASUS+Transformer+Pad+Infinity+TF700T&p=20&s=16
4a. Take the US SKU recovery file for 9.4.5.30, extracted the inner zip file
4b.Rename extracted file to EP201_768_SDUPDATE.zip - (needs the .zip extension)
4c.Put this on the microSD card (IMPORTANT: put this on the micro SD card ALL BY ITSELF, MAKE SURE THERE IS NO OTHER FOLDER OR FILE ON THE SDCARD OR IT WILL NOT WORK!) insert microSD card in TF700T
5. Start with pressing PowerOn+VolumeDown\choose RCK\Hit VolumeUp to choose the RCK selection\it will take 10-15 minutes to complete, be patient.
I'm suppressing the OTA JB update daily until I read some good news about it. In the meantime, I'm rock-solid stable & very happy with ICS!
Good Luck,
Mike