If you're unable to find a reliable Mediafire link, consider these alternatives:
The main issue with v342 is memory allocation and render distance. To fix: minecraft psp 342 download mediafire fix
Minecraft PSP is a homebrew project (fan-made), not an official release by Mojang or Sony. Because of this, there is no official support. Be careful when downloading files; always scan them for viruses before running them, as many "Mediafire" or "Direct Download" links on fan sites can contain malware. If you're unable to find a reliable Mediafire