PowKiddy firmware modification utilities

• Tested on PowKiddy X70
• Required python3.7 and later for work.
• For update firmware: Upload "update.zip" to root folder of SD (TF) card and power on device

What done? Plans?

• [x] Firmware OTA (update.zip) unpack
• [x] Firmware OTA (update.zip) creation
• [x] Firmware (.fw) unpacker
• [ ] Firmware (.fw) creation
• [ ] Firmware uploader (ADFU)
• [ ] .res and .str packer/unpacker tools (image and text resources files)
• [ ] .sty editor (Style/theme description file)
• [ ] More languages support?
• [ ] Custom theme?
• [ ] Add support for PS and XBox gamepads
• [ ] Add usb-lan/wifi modules support? (Device already have hidden browser!)
• [ ] More applications?

Hardware:

CPU: ACTIONS OWL SoC, 4-core @ 1.3GHz, Cortex-A9, ARMv7l (ATM7051H ZH72NMP 25C)
GPU: PowerVR SGX540 (??)
RAM: 256MB DDR3 (SEC 816 K4B2G16 46F BYMA)
ROM: 128MB Nand (Spansion, S34ML01G200TF100)
LCD: 1024x600 TFT panel + HDMI output (with sound)
AUD: 2xHAA2018 (Class F audio amplifiers, 6-12W)
PWR: ATT3002
BAT: Li-po, 3500mAh, 3.7v (12.95Wh)
LCD: KHX070BG-27A (20220928)

NAND partitions: