I took a closer look and compared M5StampS3A vs M5StampS3 BAT and I must say that it is not possible to do any piggyback for pin mapping at the M5StampS3A level since ESP32-S3FN8 vs ESP32-S3-PICO-1-N8R8 have differences in the number of GPIOs (6 pins error), see the difference table below: [image: 1774204115000-f8a8e80c-1dca-472a-ab48-dac7e6656c42-image.png] So it only remains for M5Stack team to upgrade M5StampS3A for 2/8 PSRAM, i.e. have M5StampS3B version.

Thanks for sharing your findings—this is really useful information, especially for anyone working with ESP32-S3 devices. The distinction between the two drivers (JTAG/Serial and the low-level modem driver) explains a lot of the issues people run into when trying to reflash firmware. It sounds like the main challenge is getting proper access to Bootloader mode when the second driver isn’t installed correctly. On Windows and Linux, driver installation can sometimes be tricky depending on permissions or conflicting drivers. It might be worth checking if the correct USB CDC/ACM or WinUSB drivers are being assigned, or trying tools like Zadig on Windows to manually bind the device to the right driver. Also, holding the BOOT button while connecting (or resetting) the device can sometimes force it into Bootloader mode if it’s not entering automatically. Good call on warning users about Flipper/Marauder firmware—getting locked out of reflashing can be a real headache. Hopefully, with more testing, a consistent driver setup for Windows/Linux can be identified. Looking forward to any updates you find!

In addition, the following screen snippet shows two possible suggestions how the 2x9@2.54mm pins can be assigned. [image: 1774182873732-efd89c09-1cce-4886-8c79-39b9ed5a4d05-image.png]

Hi. Thanks for posting the code. Can you confirm if this is a once-and-done write to the BMI? I code in micropython and wonder if I can run your code and then flash back to micropython and it'd still work.

the following is a screen snippet of this board: [image: 1773945187568-257aff04-e4f1-494f-bec9-7aa804edaf32-image.png]

@shaulliv I also tried changing the following settings: frame_buffer_count: 2 frame_buffer_location: dram and priority: 1000 lowered resolution to 320X240. and External_Clock frequency: 8MHz All without success.

@skyflyer said in External 1S LIPO on M5Core2 BUS PIN1 and PIN30?: I tried to find information about it, and want to confirm that it is OK to connect the external Lipo battery to pins 1 and 30 on the "BUS expansion port"? And that the battery will be charged when connected to the external USB power? If you look at the schematic you will see that pin30 on the bus and VBAT (on the lipo connector) are the same. So yes, you can replace the internal battery with an external one with the same voltage! @skyflyer said in External 1S LIPO on M5Core2 BUS PIN1 and PIN30?: And I don't need to remove the internal 500mAh battery, since they would be connected in parallel anyhow? Do not simply put rechargeable batteries in parallel. Disconnect the internal one. You can have batteries in parallel but.. at a minimum you need some diodes to prevent them back-charging each other, have a look online where there is a lot of info about this.

@harrietteytlxv222 did you read my post from Feb 12 (follow the link)? Do you use the appropriate emissivity value for your surface?

@himlol is comport detected in M5Burner? do "erase all" option then pick up correct firmware M5StickC, M5StickC+, M5StickC+2

@GusBel use M5Burner and load fresh firmware

@flyingjeepman on/off button on? is M5Burner detecting com port when usb is connected?

Hi Alex, If I am understanding your question correctly you should be able to find the Demo within the M5Burner application? [image: 1773598305793-b15067aa-60f4-498d-8dca-36ac7975925a-image.png] Hope this is what you are looking for? Thanks-Brian