You can unlink your device following this tutorial.
You are confusing a few things here. You are probably;y connected to uphold which has 4 device limits. The links you have linked are those of metamask fork wallet. The in-built new metamask wallet is different from the uphold wallet. Also, for android the 25 BAT limit is not necessary. Assuming you already have uphold account. Login into uphold from your android device. Then, go to rewards panel and click on connect to uphold. Do the steps and your rewards (BAT) will be deposited directly into uphold. You can do it even if you have 0 BAT or below 25 BAT’s.