[Asus  Eee Pad Transformer Prime] 1wayjonny:
OK after many tries I have come up with a method to get any locked/unlocked, tablets any SKU (but will convert to US in process) as long as you have root. Not only will it get any troubled installs going it should leave you with a blazing fast tablet.

The problem was your partitions are dirty as could be and this will help clear this up - No busybox, no missing files, no mismatched files, no mismatched build.prop, etc

I was going to post this tomorrow after cleaning up but thought to give the steps for any who who can painfully read this now, its very late and I am tired and its broken into a many step ramble but it should clean enough for most people but noobles of xda may have trouble. WARNING this has missing links, credits, and proper spelling and formatting and may have a few random thoughts =)

I will clean it tomorrow.... when i have time. Hope this helps

Recovery blob: http://xdaforums.com/showthread.php?t=1601942

Autoroot: http://xdaforums.com/showthread.php?t=1706588

US .28 Blob: http://dlcdnet.asus.com/pub/ASUS/EeePAD/TF201/US_epaduser9_4_2_28UpdateLauncher.zip

JB Update File (dlpkgfile): http://xdaforums.com/showpost.php?p=32099246&postcount=154 (You should only need the JB update from this post, credit to OG posters of dumps)

!!Must have root before hand, this will not be covered !!

!! If you forget to back up your root it will be lost until a new method can be found, DO NOT MISS THE ROOT KEEPER STEP!!

!!Back up all your data from your prime off your device, even your sdcard all will be lost!!

Download Original US .28 Update from Asus (Link)

Extract the zip files, then the other zip file move the blob to /tf201 on your computer

Download CWM Recovery from XDA (Link)

Extract to recoveryblob /tf201 on your computer

Download JB Update from (Link)

Extract dlpkgfile to /tf201 on your computer

delete all folders and files on your primes internal sdcard - EVERYTHING!

Move the three files from your computer to the root of your internal SDCARD on your prime

go to ADB on your computer and shell in to your tf201

adb shell

when in shell elevate the prompt by "su" then enter

Lets flash the exact recovery in the link I have given you. Others may work but you can use this for the time being.

dd if=/data/media/recoveryblob of=/dev/block/mmcblk0p4

Exit from the shell

Power down your prime

Hold volume down and power on, when you see the message to boot into recovery press volume+

here you want to wipe everything

Wipe Dailvik Cache

Wipe System

Wipe Data

Wipe Cache

Repeat to make your OCD feel good if necessary

This should totally clean your device except a path called "/data/media" aka your internal SDCARD

now adb shell to your tablet in recovery mode form your computer

then elevate with "su" then enter

then navigate "cd /data/media"

do "ls" to make sure your three files are still there after all the wipes

if so lets now flash the clean.28 US update over your properly formatted tablet

dd if=/sdcard/blob of=/dev/block/mmcblk0p4

reboot

once in clean system turn on ADB, now lets root the device.

Use the Auto root here (link), once done continue

IMMEDIATLLY USE your preferred root keeper here! Don't come back crying

adb shell to your tablet

"SU" to elavate

lets check for all the usual missing files and problem others were having

check for recovery dir here "cd /cache" then "ls" and you should see recovery, if not then MKDIR recovery (you should not have to do this but not a big problem)

then navigate to xbin to check for the missing three files, you should not need them but referenced here: http://xdaforums.com/showpost.php?p=32099246&postcount=154

"cd /system/xbin" - if all good move on

now copy the update to the cache

"dd if=/data/media/dlpkgfile of=/cache"

then enter the appending autocommand to the recovery

"echo '--update_package=/cache/dlpkgfile' >> /cache/recovery/command"

exit shell

shut down prime

turn on with volume down held down, press volume up to boot RCK kernel recovery msg appears

this will start the auto update with with the US JB update with stock recovery

This should be problem free and take 10 min to finish

Since everything was formatted properly you should see a very speed tablet in 40 seconds of boot to home screen on prime. I had ZERO lag