Damn, i thought you had fixed it as you had gone quite for a bit (obvs to get ista+).
Was thinking the other day that I don`t believe in coincidences - You are quite right that a battery going flat shouldn`t cause issues once recharged. But messing with the electrics to install a rear-view camera could!
If you are 100% the battery is holding charge through the attempted start and have tried jump starting using a donor battery, then next step is to undo what you`ve done with the rear-view install. imo
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