AMB82-mini BOOT Err Invalid RAM Img Signature!

Technical Discussion
1

Hi! I’m trying to load code to my AMB82, however, when i connect it to the arduino IDE I get the following on my COM port:

== Rtl8735b IoT Platform ==

[Normal mode]
BootFromNORFlash
[Start Boot ROM...]
=== Load PARTBL ===

[BOOT Err]StartUp@0x0: Invalid RAM Img Signature!Boot_err(0xe2001811)

I tried restarting, holding the upload button, but no success.

2

Try “Erase All Flash Memory” follow the guide
https://www.amebaiot.com/en/amebapro2-amb82-mini-arduino-getting-started/

3

Didn’t help :frowning:

  Enter Flash Mode!
  Start Erase Flash
    Erasing..ping fail 

ping retry fail 

NOR flashloader loading fail

Uart boot fail
  End Erase Flash

== Rtl8735b IoT Platform ==

[Normal mode]
BootFromNORFlash
[Start Boot ROM...]
=== Load PARTBL ===

[BOOT Err]StartUp@0x0: Invalid RAM Img Signature!Boot_err(0xe2001811)
4

Hi @sp9dev, May I know if you have enter download mode on the board before uploading?

Firstly, to erase all the flash memory, you have to go to “Tools”-> “Erase All Flash Memory (16MB)” and select “Erase only” or “Erase then Upload”. Then, enter download mode by pressing and holding the UART DOWNLOAD button. While holding, press on the RESET button and release both UART DOWNLOAD and RESET buttons before clicking on upload. You can refer to the YouTube Tutorial Video here: https://www.youtube.com/watch?v=_rLiih5RkXY

You will be able to see the following once you have successfully entered download mode in Serial Monitor.
image

5

Yes, I’m doing the sequence (UART DOWNLOAD button and RESET button) in all combinations, but it never enters the image download mode, it always stops at the Invalid RAM Img :frowning:

6

what is the cause of this error?

7

Hi @divadiow , May I know what error are you encountering?

8

i have that same issue

9

HI @MJK ,

Please refer to this post,

10

it says boot img fail

image.png
image.png419×394 6.57 KB

on my AMB82 MINI RTL8735BDM
i checked the board info its says Null on S/N and board number
I think it may have corrupted the bootloader
Can you help me set up a recovery boot mode via UART? or any contacts regarding this one to revive my module?
I’d be happy to appreciate your assistance.

11

Hi @MJK ,

May I know if you tried erasing the flash?

image
image659×696 23 KB

12

Thank you i just saw your email, Fortunately i just revive …

Can i ask if when to use the erase all flash memory?

13

when ever you thing the firmware are not working as excepted

1 Like
14

thank you so much ! it works :>\