Moto G only booting into fastboot mode (system and recovery not working)

[snowmotion]

Hello,
I bought a used Moto G osprey, european version with 2GB of RAM.
It only boots into fastboot mode, normal boot or boot into recovery don't work. When I try to start the phone normally, it gets stuck at the "M" logo, restarts after a few seconds and does the same again. It's bootlooping.
What I already tried:
- Going back to stock according to https://forum.xda-developers.com/2015-moto-g/general/guide-fastboot-flashing-factory-t3187750 throws a 'Preflash validation' error, probably because the installed system is a newer Android version
- Flashing TWRP 3.3.1-0 via fastboot works, but I can't seem to get into it after installation. When I try to get into recovery mode through the fastboot menu, I come back into the same bootloop.

Any help on what could be going wrong?

 

[R1ffR4ff]

Can you see the phone using ADB Fastboost on a PC?

 

[snowmotion]

Can you see the phone using ADB Fastboost on a PC?

No. It's really strange.
I have some experience with flashing, did some on a Galaxy S, S2, S5 and HTC One M7, but never encountered such an error.

Could it be an hardware failure? If so, how could I confirm this?

 

[R1ffR4ff]

No. It's really strange.
I have some experience with flashing, did some on a Galaxy S, S2, S5 and HTC One M7, but never encountered such an error.

Could it be an hardware failure? If so, how could I confirm this?

I think only a Moto Service center could help but have you tried these Motorola USB drivers just in case?

https://support.motorola.com/us/en/drivers

 

[snowmotion]

I think only a Moto Service center could help but have you tried these Motorola USB drivers just in case?

https://support.motorola.com/us/en/drivers

Well, I'm using Linux, so not using any drivers at all.
How do the Moto Service centers work if I do not have a guarantee?

 

[R1ffR4ff]

Well, I'm using Linux, so not using any drivers at all.
How do the Moto Service centers work if I do not have a guarantee?

I don't know how they work just that they are there. Alternate idea.Phone around for a local small phone repair shop.They should be able to help and or borrow a Window's Laptop?

 

[snowmotion]

I don't know how they work just that they are there. Alternate idea.Phone around for a local small phone repair shop.They should be able to help and or borrow a Window's Laptop?

Thanks for your tip, going to try that out and report back.