Hi,

You can try to reset your switch and clear the cache of your browser. 

I also see that TP-Link releaes the new firmware for TL-SG1016DE V3 20180629. You can have a try.

Many thanks,

The hard-reset forced the change of firmware.

All good now, I was also able to flash the latest version with any issue.

Great forum and support !

Laurent

Just like the OP I too today(1/10/2021) could NOT update firmware from

     current FW=1.0.1 Build 20170530 Rel.39380

     latest published=1.0.1 Build 20180629 Rel.58355

The firware update would stop at 11% and issue an error. The old firmware was still in place and fortunatly the switch did still work.

So I tired the suggestions in this forum for clearing browser cache and doing a hardware reset button on front of unit for >5sec. To my surprise the unit would NOT hardware reset. I also logged in and attempted the reset from the admin control options and again after the reboot the unit still had not reset since it still had all my custom settings rather than the factory defaults. So I pwr cycled the unit and than pressed the hardware reset button again and this time it reset to factory defaults. I was than able to login using the factory defaults and upload the latest firmware. I than went back in an manually restored all my desired settings. Hope this helps someone else.