I have exactly the same problem. I've ran through all of the steps as you have and I'm pretty much desperate as well. Maybe to add something to the background... I've also tried to update hboot and even install 4EXT Recovery v2.2.7 RC5, but unsuccessfully.
I always get the I/O error on adb.
C:\Users\E6410>adb shell
~ # su
su
/sbin/sh: su: not found
~ # dd if=/dev/block/mmcblk0p18 of=/sdcard/backup.img
dd if=/dev/block/mmcblk0p18 of=/sdcard/backup.img
dd: /dev/block/mmcblk0p18: I/O error
~ # dd if=/sdcard/hboot.img of=/dev/block/mmcblk0p18
dd if=/sdcard/hboot.img of=/dev/block/mmcblk0p18
dd: can't open '/sdcard/hboot.img': No such file or directory
~ # dd if=/sdcard/hboot.img of=/dev/block/mmcblk0p18
dd if=/sdcard/hboot.img of=/dev/block/mmcblk0p18
dd: writing '/dev/block/mmcblk0p18': I/O error
1+0 records in
0+0 records out
0 bytes (0B) copied, 4.734085 seconds, 0B/s
~ #
This occurs when I try to update hboot.
If I try to flash hboot.img or recovery.img through fastboot, it tells me:
C:\Windows\system32>fastboot flash boot ..\hboot.img
error: cannot load '..\hboot.img'
C:\Windows\system32>fastboot flash boot ..\recovery.img
error: cannot load '..\recovery.img'
I'm running out of ideas. Please help!
I always get the I/O error on adb.
C:\Users\E6410>adb shell
~ # su
su
/sbin/sh: su: not found
~ # dd if=/dev/block/mmcblk0p18 of=/sdcard/backup.img
dd if=/dev/block/mmcblk0p18 of=/sdcard/backup.img
dd: /dev/block/mmcblk0p18: I/O error
~ # dd if=/sdcard/hboot.img of=/dev/block/mmcblk0p18
dd if=/sdcard/hboot.img of=/dev/block/mmcblk0p18
dd: can't open '/sdcard/hboot.img': No such file or directory
~ # dd if=/sdcard/hboot.img of=/dev/block/mmcblk0p18
dd if=/sdcard/hboot.img of=/dev/block/mmcblk0p18
dd: writing '/dev/block/mmcblk0p18': I/O error
1+0 records in
0+0 records out
0 bytes (0B) copied, 4.734085 seconds, 0B/s
~ #
This occurs when I try to update hboot.
If I try to flash hboot.img or recovery.img through fastboot, it tells me:
C:\Windows\system32>fastboot flash boot ..\hboot.img
error: cannot load '..\hboot.img'
C:\Windows\system32>fastboot flash boot ..\recovery.img
error: cannot load '..\recovery.img'
I'm running out of ideas. Please help!