are they made specifically for your device? if they were made for another device, twrp and lineage will not work and you could brick your device.

 

Well you just said you had a Lineage ROM, so the question is was that ROM built for this model of tablet? That's the key requirement for any software, it must be built for your device, not a different model. It's particularly important that the recovery (TWRP) is built for your model, because flashing a TWRP that was built for a different model could mess your tablet up very badly.

I don't know this device, so I don't know about ROMs or software built for it. I'd suggest seeing whether there is a subforum for it over at XDA-developers: if there is then you should be able to find the software you need there, and instructions for flashing it.

How you install software can vary between devices. The general rule is that you unlock the bootloader then use a program called "fastboot", which you install on a computer, to flash TWRP (or other custom recovery) to the device. You can then back up the current ROM and flash the new one using the custom recovery. Note that on most devices the process of unlocking the bootloader will factory reset the device, so make sure you back up before you do that. But it may be that there is a different approach for this device, you'll need to find someone who knows this model to answer that if so.

 

and from the looks of it there is no twrp or lineage os for your lenovo tab 2 a7 10F

 

yep there is no way as of right now, and most likely will not be. your device has absolutely zero dev support.

just remember no dev=no fun.

get another device that has a better dev support