Originally Posted by madmaxx82
No, this is not the problem. Also it's not true that you cannot flash 4ext from fastboot.
That's the only reason why you get your recovery images saved onto your sdcard too when you install a new one.
You don't "lose" your recovery and the problem is he is not able to use fastboot commands at all. So he cannot flash RA either!
Fastboot is completely unrelated to the recovery.
If you cannot get fastboot to work, I would flash your previous hboot via a bootloader flashable zip.
I noticed that ADB interface has an exclamation point on the PC's device manager. So I reinstalled the driver but didn't work initially. After 2 reboots, I was able to get into fastboot mode and tried your suggestions. .
fastboot erase cache
fastboot erase system
fastboot erase userdata
After that, I am now able to access 4ext recovery completely. Problem was with my PC, after all. Hopefully, I can flash new ROM now.
Really appreciate your help on this. Thank you again!