1

Hi I can´t upgrade my 300M to the latest Firmware.
I tried uboot (Version with only 1 Upload Button).
But nothing helped.

2

Does the router still boot? Can you upgrade in openwrt?

https://dl.gl-inet.com/firmware/ar300m/nand/v1/

You should download the .img file to use in uboot.

3

Hello,

I tried this many times, Uboot works /only with one upload button (is it too old?)
When I want to upload the img nothing happends (ERR_CONNECTION_RESET) With Chrome, Internet Explorer and Edge.

4

It is not old. It is new.

The error seems command. Not a browser issue. Maybe try another Ethernet adapter.

5

I know this topic is old, but I came across it in my search.

I had all kinds of problems just trying a straight upgrade (from 2.27). I tried everything: web UI, u-boot web UI at 192.168.1.1, even tried sysupgrade command, none of it worked for me.

Some people had success going from 3.105 to 3.216 to 4.3.17 (as mentioned here). I did not try that way.

What worked for me was flashing vanilla OpenWrt, and then 4.3.18. I can't find link to the post where I got that idea (and linked to correct OpenWrt version), but I will edit this if I come across it again.