Hi, A few years back I used to play around with BIOS's using CBROM, Phoenix BIOS Editor etc. but more recently I mostly used Andy's Tools for injecting SLIC tables... Now I'd like to have a go at manually editing BIOS's again but it seems things have changed a bit and the tools that used to be used are not used anymore? I've got a DELL 745 OptiPlex BIOS for example, and this won't open in Phoenix BIOS Editor (no BCP's found?). Andy's Tools seems to uncompress all the module rom's but then I get a HDR Checksum Incorrect... I wonder if anyone might be kind enough to fill me in roughly with regards to what tools are the best now to edit BIOS's manually, and rebuild/put them back together afterwards? ..and yes I have searched the forum as best as I can, but it seems that most of the info is old for manual bios editing (2007). Any guidance appreciated, just a point in the right direction would be great. Thanks, James.