It did not go through by setting bootmode to 4002 and I looked at normal boot value.
Surprisingly, it was 1 instead of 4000.
So decided to set it to 2 (issuing 'idme bootmode 2' with superuser via adb)
After reboot kindle showed 'A n d r o i d' text followed by following screen:
IP = 192.168.101.101
DIV = KC1A3A04-20120809
SN = SOMESERIALNO
MAC = SOMEMACADDR
TOUCH FVER= 10.2.6.0
I can see the device in Windows device manager as Android ADB Interface, but neither adb nor fastboot can comunicate with device.
I do not own factory cable.
How can I return it to normal boot?