[Asus  Eee Pad Transformer Prime] sledgie:
I think there is a *slight* confusion regarding people having semi-bricked primes and people just having the update download and fail during install - only the latter option gets them to boot back INTO Android ICS and getting an error message saying it reverted back to .21

This method, while it CAN be used for people who can still boot into ICS, is mainly for people who cannot. Their prime is stuck on the Asus screen, and no matter what type of reset (you can even try wiping your prime, it still won't matter) they cannot boot into ICS without downloading the proper firmware, renaming it, placing it on microsd, pinhole reboot, etc. etc. etc.

First, I truly hope those of you who, like roel, have a black screen even upon reboot, let their prime drain.

Drain, drain, drain!! until it won't turn on anymore or vibrate when you hold the power button (and try holding it for 30 seconds, or putting a paperclip in the pinhole below microsd slot). This way, you know it's completely dead and you can troubleshoot.

Once drained, plug it into the wall charger. Does a red battery icon flash quickly on the screen after about 10 seconds? If it does - that's GREAT news. If it doesn't, I suggest leaving it plugged in for 5 minutes but watching it - is it charging? Is the power button orange? If after 5 minutes you don't see the icon, **while it's charging** try placing a paperclip in pinhole again and see if you can feel it vibrate. As long as you have some power coming to the device, it's good news. UNLESS of course, your volume UP button is STUCK - and if it is, I highly recommend seeing if you can unstick it without breaking it. In one of my old cases I used for the Prime, which was made for the Acer Iconia A500, it was so tight a fit that sometimes when i turned it on the screen wouldn't come on because the volume button was stuck ! I freaked out a lot but eventually found out it was in APX mode. When I took it out of the case and reboot, VOILA!

That said, lets say you've followed the steps carefully. When you press and hold your power button until it vibrates, you are STUCK on the asus splash screen. You've downloaded the proper firmwares. You've renamed the files, did a pinhole reset, held down and power, and then pressed up into asus' recovery mode.

As a sidebar - i'm guessing those of you who have CWM installed HAVEN"T gotten to this part - I'm guessing you can boot into CWM, apply any .zip or update, etc., reflash. And if this is the case, than this particular scenario only affects those of us who are LOCKED, and rooted or unrooted doesn't matter.

I would suggest to downoad the .21 Launcher Update and .28 Launcher update of your respective sku's from cky2000's thread. Don't use the Asus TW ftp.

this is from cky2000's thread xdaforums.com/showthread.php?t=1429873

First, for me cky2000 site was much faster. I downloaded both .21 and .28 using my phone in under 30 minutes a piece. There is no md5 checksum, which sucks, but I also suspect that possibly people who downloaded the firmware from Asus' ftp might have had a slight error, even if it unzips. I know, i know it doesn't make much sense. But, it does. So first, download the proper firmwares from cky2000' dump. Try it all again, slowly. The whole resets thing doesn't make much sense, even to me. It doesn't make sense to me about trying to run .21 first either. But it worked.

Before your last option below, you may want to try a different microsd card. Format it in your android phone if you have one, and then try moving the renamed files over to it. Again, make sure they are in the root directory as one of my previous pictures shows.

If you want to try to WIPE your system - if you feel ok with that - try it as a LAST RESORT. Don't get mad at me if you have lost countless pictures. I lost everything of mine (accidentily my finger twitched on the main screen when you have two choices) and I wouldn't want that to happen to somebody else. Lucky for me, all of my pictures were backed up to Dropbox and my WD Passport (and Asus if you are reading this, how about your next dock you add USB 3, hmm???).

If you did the fresh microsd card, and the wipe, and followed those instructions all over again and it still didn't work?? PM me and i'll give you my gtalk screen name. It's a shame this stuff happens to our Primes - because truthfully, it's *not our fault*.

I really hope this works, because this is an expensive piece of equipment, and those of us that upgraded the firmware (no thanks to a useless Wifi Direct) due to various reasons shouldn't be caught off guard when it freezes. I can't imagine the people that DO have this tablet and don't see threads like this - and aren't even rooted!!!!!!