You're looking for information on the "3310-Nhm-5-Flash-File". Here are some details:
Required Hardware: A specialized flashing kit or an MBus/FBus data cable connected to the test points located under the battery compartment. Standard Software Tools: 3310-Nhm-5-Flash-File
Flashing this device requires specialized hardware and legacy software because it does not support modern USB-based flashing: Flashing the Nokia 3310 - The Quantum Archive a folder sat open. Inside
On the monitor, a folder sat open. Inside, a single file glowed in bold white text: 3310-Nhm-5-Flash-File. replaced by a solid
On the workbench, the Nokia’s screen cleared. The chaotic shimmer vanished, replaced by a solid, comforting white backlight. The pixels aligned. Two words appeared in stark black letters, the most welcoming sight in the world of hardware repair.