Bought a device from ebay and it seemed stuck in a boot loop. I found the recovery tools on here which appeared to be for this device and made sure I could see it in fastboot which I could. Unfortunately something seems to have gone wrong with the process and now it just boots to the tp-link logo rather than constant rebooting (I'm presuming the bootloader perhaps corrupted in the process). It doesnt appear on usb at all. Anything I can do now? I'm an electrinics engineer and could probably hook up jtag or similar if someone has the right files or a detailed recovery process.

Its an M7650(EU) v1.1 on the sticker under the battery. I'm wondering ig the Qualcomm Emergency Downloader might work although I dont see that appearing on usb as it boots so would welcome any suggestions as we dont have volume keys like the phones do to access any of these modes.