First of all , thanks man for helping me.
Here's the first thread that I have opened if anyone is interested:
I was finally able to get past the HTC boot logo and use the phone but I also wanted to update the ROM to KitKat 4.4.
I have changed my CID to HTC__001 from HTC__K18 with no effort , however , I failed to change my MID to PN0710000.
I followed this tutorial step by step (http://forum.xda-developers.com/show....php?t=2322820) , but when I applied the fastboot oem writemid command , there was an unknown error and when I rebooted the phone I got the exact same screen as this:
Now , I'm unable to access anything!!! I can't even get to the bootloader or recovery which was possible with the soft brick. The only 2 screens that I am able to get now is the gray screen as in the picture above , or a complete black screen (and the device still stays on).
I'm unable to use any adb commands , but fastboot commands still work. However , I'm unable to flash any RUU , rom , CWM , TWRP , boot...
Is there's anything I can do about it?
Here's an output of the fastboot getvar all:
Anyone have any idea what can I possibly do to fix this?