Amlogic_s905W2_S4

Info about Amlogic S905W2 ANDL recovery procedure

Recover from erase bootloader

When you flash wrong bootloader for Your device, there is a way to boot it from USB/RAM using new adnl protocol.

When bootloader is damaged or erased you will see on UART something like this: S4:BL:25dcde;ID:00D9A30840B12824;FEAT:30F:1FFF0000:B002F:19;POC:FF;RCY:0;OVD:0;DFU:0S4:BL:25dcde;ID:00D9A30840B12824;FEAT:30F:1FFF0000:B002F:19;POC:FF;RCY:0;OVD:0;DFU:0;eMMC:0;RD-0:0;CHK:0; It means that device is in recovery mode using Amlogic new ADNL protocol. To fix this you need:

1. USB Male cable (both sides)
2. Original firmware (or slimbox firmware) to have 2 files: DDR.USB and bootloader.PARTITION
3. ADNL Tools (you can get from this repo for Windows)
4. Amlogic USB drivers
5. FAT32 formatted USB drive

How to

1. Connect USB cable to USB port and PC. Connect UART pins to have console access.

2. Place DDR.USB and bootloader.PARITION in same directory as adnl.exe

3. Place bootloader.PARTITION on USB drive.

4. Check connection between Amlogic and PC: adnl.exe devices should show somethiing like 00d9a30840b1282400000000 Aml_DNL

5. Next check if device is in BL1 mode: adnl getvar identify should return DNL mode [BL1] 06-00-00-00-00-00-00-0F

6. Upload to memory BL2 stage from DDR.USB adnl bl1_boot -f DDR.USB should return: MSG[DNL]Amlogic USB DNL tool: V[2.6.3] at Aug 20 2021 bl1_boot[DDR.USB]... MSG[DNL]device mode:06-00-00-00 MSG[DNL]soc[37], feat 0 MSG[DNL]download sz is 0x00029800 MSG[DNL]okay download bl2 response: OKAY [ 0.045s] finished. total time: 0.046s

7. On UART console you should see: INFO: bl2_load_bl2ex start! INFO: load ... Load: BL2E From: USB - 1.0 src: 00002000, dst: 00fffff0, size: 00011000

8. Load BL3 (U-Boot) from bootloader.PARITION: adnl bl2_boot -f bootloader.PARTITION and result should be booting U-Boot from RAM.

9. Interrupt it on command line befere autoboot. Place USB stick into second USB port in BOX and flash it to MMC: usb start usb_update bootloader bootloader.PARTITION and you should see: BURN bootloader.PARTITION to part bootloader OK! =====>Burn part bootloader in fmt normal OK<======

10. Disconnect USB cable and issue reset in U-Boot command line. Box should work again.