Can't Access Recovery Menu

Hi, new here, but I need some help with my PSP. I just upgraded from 3.40 OE-A to 3.52 M33-4. I want to upgraded to 3.71 M33-4, but when I run the updater I just get the message that I need to have 3.52 M33-4 or later and the PSP resets. I wanted to get into the recovery menu to make sure it was set to the 3.40 kernel, but I can't seem to get the recovery menu open. It always worked in the past with 3.40 OE-A and everything else is working fine. But I hold the right trigger and turn it on and it just goes to the regular XMB. Any help is greatly appreciated. Thanks!

Anyone?

Put the updater in the game352 folder.

Alright, I'll give that a try and see if it works. Thanks.

Just tried it and the PSP only recognizes it as Corrupted Data. Anything else I can try?

Are you sure it's the right file?
Download the 3.52 M33 update from www.dark-alex.org (Not M33-4) then get the 3.52 official update, and do what is required.

Try it that way, then if that works, update to M33-4 while on 3.52

But I already have 3.52 M33-4. I'm having a problem getting 3.71 M33 installed.

Are you sure you have 3.52 m33? System setting, system info.

Positive. When I go to the system settings it says it is version 3.52 M33-4.

You're using the 3.71 m33 updater not the 3.71 m33-4 updater right?