Thanks, and adding to the confusion again, what's this mean exactly >> I used a flash for another systems BIOS
Is your system K52F, or not, look on the bottom of the case? It doesn't matter now, since you can flash in K52F now, but the above makes it sound like you had maybe K52E or K52G and you flashed in K52F anyway (Made up model name examples)
I think I can unlock this for you, in case I need it, can you please add a single image of all your main BIOS pages (Like main, advanced, security, boot, save and exit). Just one of each, no need to scroll to show everything, and please put them all in a zip file.
IN your search for unlocked BIOS for this model, did you find a flash method for mod BIOS for similar models? Usually you cannot flash mod BIOS via EZ Flash, so you have to use some version of AFU or FPT etc.
Speaking of FPT, I do see ME drivers on your download page, can you check BIOS main page and see if you see ME FW version shown. If not, please download HWINFO64 and check in the large window on the left side, expand motherboard section and look for ME section and inside it find ME Firmware version (If it's there). I know these older systems use ME, but I can't remember if there was FW in the BIOS or not. If you cannot find, lets try this anyway, download this V6 ME System Tools package
https://mega.nz/#!rVt3jJCC!-l2IP-MnuK993...z78XBCXfwU
Inside you will find Flash Programming Tool folder, and inside that a Windows folder. Select the windows folder, hold shift and press right click, choose open command window here (Not power shell) and then run the following two commands and zip and upload the created files for me to check
FPTw.exe -bios -d bios.bin
FPTw.exe -desc -d fd.bin