[Q] Htc Hd7 rom installing question

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http://forum.xda-developers.com – My hd7 has a 7.5 WP version and i have a 5.xx bootloader version i want to downgrade my bootloader in order to flash a custom rom and i have a firmware version that ends with 707 so can i flash the rom founded on this thread: http://forum.xda-developers.com/show....php?t=1028398 to downgrade my bootloader version Thank you in advace for your help ;) (HowTos)