Edit nbh header?

[tty7]

Hello,
I wanna change operator string (example T-Mob**** > ERA)
Its possible?
I try Hexedit it, but flash utility say: "BAD MBH".
Nbh named ****_SIGNED.nbh.
How i can sign this file? it is possible?

PS: My artemis stuck in IPL\SPL.
And original rom not is avaiable.

[gghh]

You cant chnge the header as this file is signed with the certificate from htc - if you change it the signature doesnt match anymore and you get the error message.

The only way is the original rom or a matching WM6 update from your provider. If these are not available you have to send it to a servicecenter.