Homebrew developer Yoti has updated Davee's Unlimited Character Version and Mac Spoofer, adding 6.20 TN support for the plugin that allows you to spoof the firmware version and MAC address of your PSP.
Added support for 6.20
Installation:This is a spoofer (aka faker) for the information found in the XMB->Settings->System Settings->System Information. This version supports the firmwares of 5.00 and 5.02 (first release) and includes spoofing of both System Version and Mac Address. So you can personalize the XMB Information for whatever you need, including your own imaginary "8.32342 0xDEADBEEF" firmware and matching mac address.
Copy the "sysconf_spoofer.prx" to the "seplugins" folder on your MEMORY STICK and add a line to vsh.txt (or create one within seplugins folder) and add the line "ms0:/seplugins/sysconf_spoofer.prx 1" and then make a "spoofversion.txt" and/or a "spoofmac.txt" in seplugins folder. Within these, write your hearts desire; with either ascii (normal text) or Unicode* (special characters). Reboot your PSP, and be amazed at your system information.