Happy to report sysupgrade of c2600 from 19.07.8 => 21.02.1 (keeping settings) OK.
Great shout out to all involved!
Only a few minor issues, some already discussed in other posts, namely:
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Due to the network interface changes brought on with 21.02.x, I had to change all my scripts that contained:
uci get network.wan.ifname
touci get network.wan.device
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menu bar (LuCI) is aligned to the left, fix to centre align:
opkg upgrade luci-theme-bootstrap
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Openvpn (LuCI), when trying to edit an uploaded openvpn config file, getting error 'Insufficient permissions to read UCI configuration' fix: Insufficient permissions to read UCI configuration
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System Load Average seems to report a higher figure compared to 19.07.8
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21.02.1 uses more space, I'm only left with 1.1MB now, compared with 2.8mb with 19.0x , I'll need to see where I can trim some packages!