TP-Link BE800 V1.20 USB port does not power NVMe drive

The most likely cause is that the BE800's USB port on firmware V1.20 is not delivering enough current for a bus-powered NVMe enclosure, so the drive either fails to spin up or disconnects under load. 1. Plug the NVMe enclosure into the BE800's USB port using the shortest, good-quality USB cable you have, and avoid any USB hub in between. 2. Connect the enclosure's own power adapter if it has a DC jack. Many NVMe enclosures need external power when used with routers, and this often resolves the problem completely. 3. Check the router's firmware version in the web interface or the TP-Link Tether app. If it is V1.20, look for a newer firmware release on TP-Link's official support page for your exact hardware version (V1 or otherwise, which is printed on the label) and install it, then test again. 4. If the drive still doesn't appear, try it on a PC first to confirm the drive and enclosure work. On Windows, open Disk Management (Win+X, then Disk Management) to see if the drive shows up at all. 5. Try a different NVMe enclosure or a self-powered USB 3.x dock if you have one, since some enclosures are more tolerant of low port power than others. 6. Reformat the drive for the router's supported file system (usually from the router's USB storage settings) only after confirming the drive is detected reliably. I cannot confirm the exact cause on V1.20 from here, and results vary by enclosure and drive model. If none of this works: contact TP-Link support with your hardware version, firmware version, enclosure model, and drive model, and ask whether V1.20 has a known USB power issue and whether a fix or rollback is available.