I tried to read back firmware/stockrom of my unisoc android phone with a free tool called research download tool but the process always fails after downloading fdl1 download

There are some other paid tools also available(I mean free cracked versions) ,I can try them but the problem is I don't have a personal pc where I can test or experiment diffrent tools, I just want to see what options are available in that tool

So if anyone have a pc with no important files or anything pm me