@stevecarter So you have an Access Point model TL-WA901ND v4. Reset the TL-WA901NDto its factory default settings by pressing the reset button on the back for about 10 seconds: Upon successful reset...

@stevecarter What's exacctly the model of your device ? It should be printed on it's bottom sticker and it looks like that:

@ppt3 Due to the factt you're using a regional FW release, it's not a good idea to use the global english version pubished here. This could lead to an error message during the FW update or...

@Zelao That's would I thought as well, hence asking you to try with a different ethernet cable. If you have a spare switch around you give it a try, or if you can borrow one from a friend. Indeed...

@Zelao That's rather unusual - your best bet would be to contact your local support for further assistance.

@Zelao Have you tried to test with a different ethernet cable (for example the one in the TP-Link router kit). CAT5e would do the job.