G3 restarts constantly - Tried to fix "no os found!" - G3 Q&A, Help & Troubleshooting

Hey guys,
i gave my mother my old LG G3 a year ago, she never had problems but suddenly she got the massage that android is updating.
She didnt know what her phone do and havent told me and now we have a disaster
The phone worked well but sometimes it restarted, booted and restarted.. Until battery was empty
so i tried to update her rom (N&N 1.3) but in the moment I started the installation the phone rebooted.. i tried to restore the backup but TWRP says "no os found!"
ofc i did a factory reset before flashing the new rom
i will now try to flash another rom.. but I have no further ideas on how to fix this issue :/
hope you guys can help us

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Sent from my phone

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