Queries on Peripherals and Android

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1.ROC-RK3566-PC does not extend the RS232 interface

2. Total length of this copper tube antenna is18cm. What length of antenna do you need, you could contact with  sales@t-firefly.com for customization

3. The source code has been open , you could download the Android11 source code in google driver https://en.t-firefly.com/doc/download/93.html#other_386 . For more information, please refer to wiki  https://wiki.t-firefly.com/en/ROC-RK3566-PC/

4. We are adapting Android 12. For now you could refer to the document at source code RKDocs/android/
《Rockchip_Introduction_OTA_from_Android9.0_Android10.0_to_Android11.0_CN&EN.pdf》

5. For mass production，we usually use Micro SD card to upgrade firmware into eMMC. https://wiki.t-firefly.com/en/RO ... de_firmware_sd.html