[Q] need help with prestigio firmware

hi all, i have prestigio pmp5080c pro, i was installed oma's jelly bean software, but it have a lot things that i dont like.. usb on the go is not working, a lot of apps and games is not working, or not working properly.. it crashes so many times.. so i want to install original software.. but i can't find it.. may be some one who have the same tablet can somehow copy the firmware and upload it somwhere and post link? thanks in advance p.s. sorry for my bad english
p.p.s. there is software update on the prestigio site, i downloaded it, but can't find the way how to flash it..