I bought this device about six months ago and was running without issue.
I was in the process of upgrading other TP-Link device firmwares so also upgraded my MR6400v2 from stock firmware to current.
Since then I get constant disconnects saying "sim card not found". A power cycle resolves this issue but I wish to revert back to the original firmware.
Please provide link as older firmwares are not available on the TP-Link sites
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