Estudante de engenharia eletrônica.
You need to unlock your bootloader.
Enable USB debugging in the developer options;
Reboot the phone in fastboot;
Connect the phone to your PC;
Run the commands bellow, line by line:
touch key.txt
fastboot oem get_unlock_key key.txt
fastboot reboot-bootloader
It should show a warning that the bootloader is unlocked;
Reboot in fastboot and install TWRP again.
I haven’t named any partition
Yes you did. It’s the recovery partition.
there is no path to the partition, is there?
No.
The device had official builds but it seems to be discontinued. Here is a LineageOS official build.
Yes. If you can’t access fastboot and the OS, you need to use the Emergence Download Mode (EDL) for you phone (volume down + power).
XDA forums has all the steps and guides to unbrick your device.
Download your firmware file (please check your SoC due to the different phone variants).
Download and compile the QDL tool with some more details about QDL here.
Enter EDL mode.
Flash your firmware as described by the first link in step 2.
Profit???
Chrome probably works the best for PWAs, maybe try some Chromium alternatives to see if works properly.
Use zerotier one, it’s much better.