# Firmware

### AM32 Bootloader Firmware

The ARK 4IN1 uses AM32\_F051\_BOOTLOADER\_PB4. You can find the latest release [here](https://github.com/am32-firmware/AM32-bootloader/releases).&#x20;

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### AM32 App Firmware

Use the latest release of [AM32](https://github.com/am32-firmware/AM32/releases).

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### Low KV Large Prop Systems

For low KV motors and large props, use the ARK\_4IN1\_RAMP\_F051 firmware which increases the maximum 0-100% ramp time to 200ms. When flashing back and forth from the standard ARK\_4IN1 firmware, select "Ignore current MCU layout".&#x20;

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