[Q] Going back to HBOOT 1.40 from 1.58?

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http://forum.xda-developers.com – I'm S-OFF from the original revolutionary unlock method and have flashed an RUU for 2.89 firmware. I'm trying to get back to HBOOT 1.40 so I can install CM10 ROMs as I've been told they don't work properly on the 1.58 HBOOTs. I've seen so many threads on here telling you how to go back but they all either refer to being S-ON or for HBOOT 1.50, not 1.58. I don't want to brick my phone (obviously) so I'm posting here to make sure and to ask which method will work for mine. I remember somewhere that it would be simple since I'm still S-OFF and all I'd have to do is flash an image with th (HowTos)