ATJ2111

From S1MP3 Wiki

These chips are called "Series 11" chips in the actions investor presentation.

AK2025

The "AK2025" chip seems to have the same pinout as the ATJ2111. The ADFU usb ids for ak2025 are: VID: 10D6 PID: FF76

Initial Analysis

It's known that these SoCs have the same Z80 MCU core and possibly the same DSP. However, the registers have been rearranged somewhat between these and the Series 9 chips, to the effect of preventing existing tools such as s1res from working properly. The differences between Series 9 and Series 11 SoCs is comparable to that between Series 8 and Series 9. Most notably, the USB and NAND flash controllers have changed substantially.