Help needed with flashing and returning to stock rom topic

I bought a htc one about a week ago ( which was a three branded phone) which I used my ee sim in it. I started noticing weird signal issues ( like full signal, but when trying to make a call it would sound like I only have one bar signal) so I decided to look into how to debrand the phone and change it to ee. I decide to go with the European (htc Europe ) version which was unbranded,

So I unlocked my hboot and s-off with firewater and changed CID to HTC__001
Ayer I done that I rebooted my phone and to my surprise went into some sort of boot loop. The white screen would pop up and then it will go black for about 30sec and reboot again And again.
Could someone pls inform me what I have done wrong and what I need to do

Thanks
Col


Sent from my iPad using Tapatalk