Eid0 & eid5

So I found some of the IDPS I had from a while back on one of my HDD's. I know them to be good a while back as one of them is the valid on I'm using now. Anyhow it reports back as longer 2.70 on a CECH-2501A which I bought ne w and got banned some years back on 3.40 factory.

Anyhow I am going to try to edit the IDPS to reflect a CECH-2501A and correct minver then try to flash it back. I'm also going to test the other two I got from my CECH-3001 and one I got from a YLOD 40GB NOR model via E3 sometime back. Anyway instead of using the long winded tutorial I wrote for PSX-Scene before Zar's awesome IDPSet I am gonna use his tool.

So I of course want to test my edits before a permanent install. Do I need to save to the EID0 or the EID5 for testing purposes to ensure I can log into PSN before the final install. So for it not to stick after reboot which do I need to write to. 0 or 5?

Edit

I am also gonna try my PSP IDPS again just for fun as its useless and one of my PSTV's I can spare to get banned if it happens and report back. Managed to snag it on firmware 3.51 via EML hack before going to 3.57 now. I know it will not work for online play but maybe I can use it to grab PSP/PS1 content still and maybe even Vita for curiosity sake.