Update:
Waninkoko came up with his own custom firmware now that supposedly allows for backing up and playing of games. WARNING: there were hundreds of PS3’s bricked within hours of this coming out because they either didn’t install it correctly or it didn’t work for their system…
So, naturally I’m going to wait a while before I actually try this.. from what I understand most of the bricks occurred either with the slim systems or from people not updating to the stock 3.55 before installing the custom firmware (or CFW as it is commonly referred to).
EDIT: I think it might actually be the fat ps3’s that have the problem not the slim because of nand size is different. here is a list from Wankinkoko’s forums.. It’s in spanish, but I’ve been using google chrome to translate. You can also follow Waninkoko on twitter: @hackinblack
http://www.teknoconsolas.es/foro/cfw-3-55-waninkoko-t94510.html