Why is this alarm panel stuck in tamper mode?

It’s an old Optima XM which came with the house. The tamper light stays on and the keypad is locked so I can’t arm it. The PIR sensors still seem to be detecting motion as before.

I’ve replaced the battery, and tried powering it off/on with battery/mains power.

When I reconnected the battery initially, the alarm went off and it let me put the code in, then when I put the lid back on it reverted to tamper.

Is there something wrong with the lid/wiring (besides it being a mess)? I’ve not touched anything beyond swapping out the battery (12v, 2.1Ah Yuvolt).

Images linked below show lid front and back, and wiring from different angles (I don’t know what those small metal hoops in the corner are for).

https://ibb.co/WnL6Ps2

https://ibb.co/vcb7TJC

https://ibb.co/LhTsxHG

https://ibb.co/d2dkZYh

https://ibb.co/3FBZT8X

submitted by /u/GenericUsernames101
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August 18, 2023
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