Upgrading MX60/MX60W from 21.02 to current without UART

[lleachii]

@mk24

I think the only thing needed between the wiki instructions and a new version is to change meraki_loadaddr from the factory original 800000 to 1000000.

@mk24

While you're in the bootloader, change meraki_loadaddr to 1000000 (it was 800000) to allow booting newer larger kernels. That is 16 MB of RAM for the kernel to load and uncompress. Since there is 512MB of RAM available, even 16 is kind of small.

I added that important information (and linked the reference so it appears in the change history) to the Wiki (https://openwrt.org/toh/meraki/mx60#flashing)