I have bricked tf300 device, i can get only into apx mode. I didn't back up bootloader using nvflash. I'm on 4.2 (27.5) bootloader. I know that if i use blob.bin from other tablet to unlock nvslash with wheelie it coudn't work, but i'm desperated and i think it's last way to unbrick tablet. I tried everything (flash epad_update from sdcard, hold reset for more than 10sec, disassembly and reconnect battery, pushing few keys combinations on power) and nothing. If this wouldn't work i'll replace motherboard. I can't find any bootloader backup file from nvflash on internet. I know that this is device-specific file, but i'll try to change device serial in blob.bin file.
Have anyone here a nvflash boootloader backup (4.2, 15.3 or higher) WW version?