Originally Posted by igloo_01
I'm fairly new to the world of rooting/custom ROMS - I rooted my Desire HD a couple of weeks ago and have installed a couple of ROMS since then (start on ice cold sandwich and curerntly on JellyTime). So far it's going well, but my wiFi signal does not seem to be very good. I know that installing a different radio may help with this, but I wanted to get a bit of help before doing this.
I've read the post http://forum.xda-developers.com/showthread.php?t=896597 which contains the guide for flashing a radio.
What I want to know is what radio should I be using? Is it ROM/phone/carrier specific? I don't want to flash the wrong radio then not be able to go back, especially since I've made it this far without bricking my phone! Also, could flashing a new radio improve my wiFi signal?
In addition to what Bananagranola said, if you flash ENG S-OFF and your device was shipped with Gingerbread you will mess your bootloader and radio won't be the main concern then.
You can flash a radio in the PD98IMG.zip way (wich is the safest way to do it) or flash modified ENG S-OFF included in the Hack Kit and after that you can find the radio threads links in the guide in my signature.
Make sure that you read carefully those threads. Flashing a wrong radio might brick your device.