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Unless things have changed, you don't need a goldcard to downgrade 2.50.405.2. It's unbranded software so should just accept the PD98IMG.zip file after the temp root commands.

im having 2.50.707.4 software number.do i need a goldcard???thanks for your help...![]()
Did it def get S-OFF? You can check in the bootloader, at the top it should say "ACE PVT ENG S-OFF". If so, just try flashing clockwork again via ROM Manager.
I think with ENG S-OFF, you can downgrade your radio too.
From my understanding, it's not a major issue with AOSP ROMs as they don't contain a RIL so as long as you use a later radio than one they recommend, it's fine. Re Sense based ROMS, you can flash a RIL to match a radio if you're not using the one recommended by the dev.
[RADIO][LATEST: 26.13.04.19] The HTC Desire HD Radio Thread - xda-developers
There are a few threads there worth taking a look at.