[Transformer TF300T General] mohlam12:
Hello,

I have a TF300T tablet which I bought from europe (WW). I tried flashing the new Asus ROM, it worked fine, then wanted to root it. The recovery (twrp) failed to install on first try, I decided to change the version, and now I think it's dead.

When I power it on, it hangs on the Asus logo, Windows tries to install an MTP driver but fails. I tried forcing the Naked Drivers, or the Asus Fastboot driver, but to no avail.

Booting in fastboot works, and fastboot devices lists it with success.

Erasing system and staging and userdata and cache and recovery does not have any effect (fasteboot erase XX).

I tried installing multiple versions downloaded from the Asus support website (like, WW_epad-user-10.6.1.8) but it freezes. The command says it sended the data successfully, but then I cannot reboot it through fastboot reboot or fastboot reboot-bootloader. fastboot devices lists the device with ??????? as its ID. Only by manually booting to fastboot that I get it to work again... with no apparent change to anything.

I tried flashing the recovery with mutiple versions of twrp, but no change appears on it whatsoever.

On the fastboot menu, once I try to access RCK, it gives "Unrecoverable bootloader error (0x00000000)" and freezes.

The only solution I still haven't tried is

dd if=/dev/zero of=/dev/block/mmcblk0p4 bs=100 count=1

dd if=/dev/zero of=/dev/block/mmcblk0p3 bs=16 count=1

But I have no access to shell with fastboot only.

I also tried multiple Unbricking tools, but none work.

Booting into APX mode (I've read somewhere that it might get me to something) fails too. Power button and volume up only boots to the Asus logo and it stays like that forever.

Can someone assist me ? I've been trying for two days but couldn't get it to work. I'm available for any supplementary details.

PS: Might help someone figure out something, here is the integral text written during fastboot:

Key driver not found.. Booting OS

Android cardhU-User bootloader (1.00 e) released by "WW_epad-10.6.1.8-20130225" A03

Starting Fastboot USB download protocol

[RCK] [ANDROID] [WIPE DATA]

(All three give the Unrecoverable bootloader error, then it's frozen)

And this is the output of fastboot getvar all

(bootloader) version-bootloader: 1.0

(bootloader) version-baseband: 2.0

(bootloader) version: 0.4

(bootloader) serialno: 015d2571651bf40b

(bootloader) mid: 001

(bootloader) product: Cardhu

(bootloader) secure: yes

(bootloader) unlocked: no

(bootloader) uart-on: yes

(bootloader) partition-size:bootloader: 0x0000000000800000

(bootloader) partition-type:bootloader: basic

(bootloader) partition-size:recovery: 0x0000000000800000

(bootloader) partition-type:recovery: basic

(bootloader) partition-size:boot: 0x0000000000800000

(bootloader) partition-type:boot: basic

(bootloader) partition-size:system: 0x0000000030000000

(bootloader) partition-type:system: ext4

(bootloader) partition-size:cache: 0x000000001ac00000

(bootloader) partition-type:cache: ext4

(bootloader) partition-size:userdata: 0x0000000332680000

(bootloader) partition-type:userdata: ext4

Oh and I can't send it to Asus. I'm not in Europe anymore, and there is no Asus retailer where I am (North Africa).