you need to boot in ur system in bootloader mode. Check the specific info for ur device on how to do that (its jist a key combonation nothing hacky)

Then once u got that u need to download adb (its in the plattform tools here https://developer.android.com/studio/command-line/adb)

Then once u add adb to ur path connect ur device and check if it really connected by typing fastboot devices
If ur device appears u have done everything correctly sofar.
Then we need to strip android of its security layers. Type fastboot erase abl and then fastboot erase bootloader (remember to recover ur bootloader after dumping by typing fastboot add bootloader otherwise ur device wont startup)

Now disconnect and reconnect ur phone. Now that we stripped it of its security layer a new device directory will appear in ur windows file manager. Theres mappings for the CPU filesystem in there so just go there and search for a folder called TEE or QSEE and copy its contents to ur desktop (or anywhere else where u work). the files are called random hashes so check the files with a tool called 7zip by opening them as an archive. Once u find the one containing the device blob and key copy those and add em to ur pywidevine directory.

hf