Migrating from CT to openwrt on MR18

Good evening,
I wonder if someone could help me, I've been using CT for a few years but recently it's stopped working...
I've got into my AP again and I can get SSH access so I can see the following:

BusyBox v1.25.1
Cucumber Tony WiFi (17.01-SNAPSHOT, b_171016_00)

I was hoping to run this command :
cd /tmp & wget http://packages.ctapp.io/MR-LEDE/mr/lede-ar71xx-nand-mr18-squashfs-sysupgrade.tar && sysupgrade -n /tmp/lede-ar71xx-nand-mr18-squashfs-sysupgrade.tar

but this happened:

Writing to 'lede-ar71xx-nand-mr18-squashfs-sysupgrade.tar'
lede-ar71xx-nand-mr1 100% |*******************************| 6930k 0:00:00 ETA
Download completed (7096320 bytes)
Image metadata not found
Invalid sysupgrade file for mr18
Image check 'platform_check_image' failed.
[1]+ Done cd /tmp

Has anyone got an idea on how I can get an upgraded openwrt installed on this box so I can carry on using my AP?

You are referencing third-party builds. The official build is here:
The default wget on OpenWrt does not support https-- so you may need to first download the image to your PC then use scp to push it to the router /tmp directory.
If platform check image fails and you're sure you have the correct image for your model and the sha256 matches then you can use the -F option to sysupgrade. That will bypass the check and do the flash regardless.

Good morning,
I've tried with the -F and didnt get anywhere, I uploaded the file with SCP as well.

root@ct:~# sysupgrade -F -n /tmp/openwrt-19.07.3-ar71xx-nand-mr18-squ
Image metadata not found
Invalid sysupgrade file for mr18
Image check 'platform_check_image' failed but --force given - will update anyway!
killall: watchdog: no process killed
Command failed: Request timed out

That is about what you should see. Everything is shut down as sysupgrade prepares to flash. Leave the router alone for several minutes and it should reboot to the new firmware.

Just to let you know, I hooked up a TTL cable, press and held 2 until it booted, it was then booted into openwrt which is what CT runs on I understand, I just just logged into, uploaded the new firmware via the LuCI and it's working great. Thanks very much for your help!

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