same pblm on other device also
Is there any stock firmware that can be flashed using twrp. R else I will make it one. Only if there is a possibility to change baseband@VPawankumar369 when you connected in bootloader, check your PC's device manager and update drivers if anything is unknown or uninstall and reinstall drivers.
It's driver problem, if you are not able to do in that PC, then ask someone else for 30 minutes.
See I can't find fastboot devices. But I can detect my mobile using adb devices. That to only when device is on.
Then I tried going to boot loader using command and then I tried fastboot device command but still it can't detect