[Transformer TF300T Q&A, Help & Troubleshooting] scott.t:
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Yes, Texa's Instruments (the Manufacturer) of the motherboard has the flashtool I believe is the answer to this problem, but I havent had time to do this myself yet, but I believe that what you would need to do, would be UN-Blob the Asus Update.zip and the take the Recovery.img and use this to flash the recovery.img to the device.

However as my own device is now technically a brick and through no fault of my own, the wipe option on TWRP worked fine on 4.1.2 however it didnt fare so well on JB-4.2.1 and to make matters worse the most recent ASUS update disables adb sideloader and the USB option has also been removed from the bootloader, so I intend to wait as I dont have time to do this at the moment as I would need both windows & linux so I can completely decompile the recovery.img

But from what I've been reading this will flash ubootin and x-loader to the device and so I figure its worth waiting until I have the time to uncompile the blob, decompile the Recovery and System then re-write a few chunks with links to armhf Debian and then do a complete Debian install with a custom bootloader and my own splash screen. ;)

See this other post by me if you want the link and walkthrough guide about how to flash your motherboard:

http://xdaforums.com/showthread.php?t=2370346

Asus suck's they give away the tool to unlock your device, then they removed adb_sideloader and USB support from the Jelly Bean bootloader.. Why? (easy answer, they're happily screwing people over by convincing them they need a new motherboard or to pay to have the device unbricked!) I think it's a highly questionable buisness practice to go giving people a way to modify there bootloader so it's unlocked at the loss of your consumer warranty so you can then modify your own device, then they issue an update which everyone insist's everyone should download for an upgrade which seems to be designed to screw people with this very problem. Fcsk Asus I already gave them $495 for the device new, they are not getting another single penny from me as a customer or as a consumer.

Everyone is sitting there saying their waiting for ASUS to release the source of NVFlash, which is bull**** the source has been readily available for age's and not just for ASUS devices (Microsoft Surface), in case people have forgotten Android is derived from Linux with Java thrown all over it for the desktop and you can not go unlocking your bootloader with a piece of software if the device has been locked from having a re-flash.. Which makes me again say.. Why?? Why would someone knowingly leave the device in a state where the NVFlash can be re-written without having to access any pins (see walkthrough) unless that was the plan all along.

Inspiring Innovation & Persistant Perfection... Dont make me laugh! Inspiring innovation how? By crippling everyone's ability to re-flash there NAND Flash, because that would mean they'd all get rid of that stupid Asus Logo!? Clearly my definition of persistance and other peoples definition of persistance are two very different things.. Oh and as for people asking for the password to the TWRP bootloader, that would be the password you the owner have set on the device. If you dont know what your own encryption password is, then you shouldnt go stealing other peoples stuff!

Asus could have designed this in a miriad of ways that would have been better for everybody all round, the only thing that is innovative and persistant is there failure.