If your devices are rooted, you could use something like Titanium Backup to backup and restore apps & data from one device to the other. You should be able to install the unlocker on multiple devices (as long as the Google account and email remain the same). There is a limit (to reduce piracy) but it's quite big.
For some reason the fps unlocker only gives me 60-65 fps max and it does literally nothing for me. If I try going on even half graphics it dips to 35, and I already did all the windows settings tricks and everything and still no difference really
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