Good day!

I have TP-Link M7350(EU) V4.1 Rev1.0. I want to use this device for my DIY Project. But since I haven't use it for so long, when I try to boot it up, it hangs on logo. I tried to replace battery, the same error. Try to use the charger same error. Try to factory reset (10 seconds) same error. It is not detected on my computer even I plug it in. I try to reflash the firmware but since it is not detected, I can't do nothing. Fastboot is not an option since it is not detected. Please help.