You can unbrick with Despertar del cementerio + Pandora

If you have a friend with a PSP 1K, you can easily create a Pandora battery

 

For anyone getting this again, I had a similar issue lately after multiple flashings (6.60-PRO, 6.61-Infinity,...cannot recall in which orders). The console would "turn on" (lights on, etc..) but not boot. I fixed it by holding start while turning it on, then promptly installed a stock firmware.

 

I haven't even heard of infinity. Been so long since I used my PSPs, that when I unpacked them from my most recent move, BOTH batteries were swollen and cracked. I am so lucky that every single thing I own didn't go up in flames .
Edit: But apart from being dead, I'm pretty sure there is no problem with my Pandora battery. Always kept it separate in my laptop case along with the memory stick.

 

I dont understand why people install infinity and latest fw to PSPs although 6.20 can run anything you want.

 

You have a fat model, you don't need infinity (which is bugged as hell).
You should install 6.61 ME or PRO.

 

I think I recall doing this because the official French eboot for FF8 wasn't booting up on 6.60PRO, or something like that. Was supposed to be fix in PRO-C3 but even this one wasn't working.

 

I have one 6.20 and a 6.60 PSP go both on LME and they connect without problem and also 6.20 can run anything (maybe except a few PSX titles) 6.60 can run.

 

C2 is the latest (although it has a bug where legitimately-purchased PSX games don't work, which the Yoti mod fixes), and while 6.20 can run everything, on a 1000 or early 2000 the best method is the cIPL flash as you can still use 6.61 plugins instead of having to rely on the ancient ones for 6.20. On a late 2000 and 3000 Infinity is generally the best, its code is much better than the 6.20 coldboot exploit and it has the potential to also be able to unbrick the console in certain situations (although nobody ever made software to actually unbrick you...). On a Go, Infinity breaks Pause and not all consoles can downgrade to 6.20, so I'd recommend just sticking with Fast Recovery. Personally, I've been using Infinity with Pro C2 Yoti mod (and a while ago I used LME) on my 3000 and have never had any issues.