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Many Chinese Pixhawk clones ship preloaded with "ArduCopter V3.6.8 248" — users stick with it because re-tuning for a newer version is time-consuming.
PX4 was the native OS for this hardware.
For the 248 target, ArduPilot is the most popular choice. pixhawk 248 firmware
| Parameter | Recommended Value (Racer) | Stock Value | |-----------|--------------------------|--------------| | PSC_ACC_P | 1.2 | 0.8 | | PSC_ACC_I | 0.8 | 0.5 | | ATC_RAT_RLL_P | 0.22 | 0.12 | | ATC_RAT_PIT_P | 0.22 | 0.12 | | ATC_RAT_YAW_P | 0.25 | 0.20 |
The original Pixhawk 1 (FMUv2) has only 2MB of flash. Newer firmware (ArduCopter 4.4+) often exceeds this limit or requires stripping features. Pixhawk 248 firmware (e.g., 3.6.11) fits perfectly, leaving room for parameters and logs. Many Chinese Pixhawk clones ship preloaded with "ArduCopter
If you actually meant firmware version PX4 v1.2.48 (a fairly old release from 2016–2017), here is what you need to know:
How to flash an old PX4 version:
Solution: Unlike modern firmware, 248 requires a 3D fix (not 3D dGPS) and at least 6 satellites. Wait longer or adjust GPS_HDOP_GOOD to 2.0 (default is 1.6).
Solution: In 248 firmware, you must manually disable the internal compass if you are using an external GPS/compass module. PX4 was the native OS for this hardware
