Hacking Are all game updates safe? Also breaking PSN-like icons

[wootwo]

For the first part of the question, I've read elsewhere that certain patches/updates to games are based on different CFW that could affect the currently installed CFW. Is this true? Is it safe to install all game updates or do I need to find out what OFW they're based on before adding any updates?

For the second part, I'm loving the ability to create PSN-like icons for the XMB, but I've read that you can't perform any updates after making the icons, but I don't know why or what happens. Is this true and if so, is there any way around this? Ideally I'd like to be able to perform updates and still create PSN icons for the XMB. This is based off of a question I originally asked in Cyan's PSN-Icon tutorial:

I see also that the info regarding updating games after doing this incomplete, but I was curious if that was simply something you haven't been able to fill in yet or if there's just no answer yet. Could I update the games on my USB drive -> return it to my PC, run ebootFIX again and then install it onto the PS3 HDD and perform the steps to make a PSN Icon?

Thanks for any help!

 

[Hero-Link]

they don't affect the CFW, but some updates might require a higher FW, making them unplayable.

check this list to see the games list.
http://www.pshomebrew.net/wiki/PS3_Backup_Compatibility_List

 

[wootwo]

Oh thank you. So the column for updates is specifying whether or not it's okay to update on 3.55 CFW? It was confusing because the key at the bottom just says "do online updates work yes/no"

Also, does the update notify you if it needs a higher FW version or just installs it?