Uboot upgrade: -------------- The following worked just without any problem on my wt3020f (8mb). Download the following archive: https://mega.co.nz/#!jdRECSxA!tq4kk0zHI6aVbDfXVdNBYf5sXXbu7xw4SsvxoP9gYe4 unzip it and check it: $ md5sum u-boot-nexx-3020-7620.bin 9002d70c8af2ca878df956934b122a39 u-boot-nexx-3020-7620.bin offer it via http, so it can be downloaded from the router $ python -m SimpleHTTPServer directly connect the router via the lan port to your computer. $ sudo ifconfig eth0 192.168.8.5 $ telnet 192.168.8.1 (login: nexxadmin pass: y1n2inc.com0755 ) # cd /tmp/ # wget http://192.168.8.5:8000/u-boot-nexx-3020-7620.bin // proceed only, if you successfully downloaded the new uboot file # mtd_write unlock mtd0 GetFileSize: No such file or directory Unlocking mtd0 ... # mtd_write erase mtd0 GetFileSize: No such file or directory Unlocking mtd0 ... Erasing mtd0 ... Erase char is 255 # mtd_write -r write u-boot-nexx-3020-7620.bin mtd0 Unlocking mtd0 ... Writing from u-boot-nexx-3020-7620.bin to mtd0 ... [w] it hangs now, just wait another minute and then power it down and start it up again To check if the new uboot works, press and hold reset-button, then connect power. Once the led flashes several times, you can release the reset button. $ sudo ifconfig eth0 192.168.1.5 On http://192.168.1.1 is the uboot-webinterface download https://downloads.openwrt.org/snapshots … pgrade.bin and upgrade it directly from uboot. (Firmware Upgrade -> generic firmware -> firmware) after a reboot: $ telnet 192.168.1.1 Trying 192.168.1.1... Connected to 192.168.1.1. Escape character is '^]'. === IMPORTANT ============================ Use 'passwd' to set your login password this will disable telnet and enable SSH ------------------------------------------ BusyBox v1.22.1 (2015-03-06 13:37:14 UTC) built-in shell (ash) Enter 'help' for a list of built-in commands.