Radioddity GD-77 Death Now alive again

[CT2HOM]

Thanks very much Jason Reilly VK7zja without you help my GD 77 was already deep in the atlantic waters.
thanks again for everything you have done
73's my Friend and all best to you

[YT5HOK]

So, you are the one polluting Atlantic ocean...?



J/K.

Good to hear you got it fixed.

[ON3GIN]

I have the same problem.

When I press side key 1 and side key 2 the green LED flashes and nothing appears on the LCD screen.

Please your expert help.

73's ON3GIN

[VK3KYY]

I have the same problem.

When I press side key 1 and side key 2 the green LED flashes and nothing appears on the LCD screen.

Please your expert help.

73's ON3GIN

Probably the copy protection data in your radio has been erased by the official firmware.

The only solution is to use a hardware dongle programmer connected directly to your radio PCB, to erase the CPU and then install a patched bootloader which does not check the copy protection data

[VA6GSB]

Hi, does anyone know how to get a hardware dongle programmer for a GD77 or make 1.
Thank you
73 VA6GSB

[VK3KYY]

Hi, does anyone know how to get a hardware dongle programmer for a GD77 or make 1.
Thank you
73 VA6GSB

If want to erase and reflash the MCU, you'll need something like a JLink, or anything else that can flash a NXP / Freescale MK22FN512 device.

When you say "make 1" what do you mean. What is your level of MCU knowledge. i.e it is possible to "make" a programer dongle using a generic STM32F103 board, which you can buy for $5, but you have to flash that board using a USB to serial adaptor, with some legacy firmware from github and solder some wires to it

[VA6GSB]

Hi VK3KYY, Thank you coming back to me, no MCU knowledge. Looking up prices for JLink on amazon.ca

[VK3KYY]

Hi VK3KYY, Thank you coming back to me, no MCU knowledge. Looking up prices for JLink on amazon.ca

Most of the JLink clones work OK.

e.g.

https://www.amazon.ca/GamlReid-Interfac ... B0C1N5XK6P

On Amazon.ca will actually be a clone.

Ones like this https://www.amazon.ca/J-Link-Debugger-D ... B0C1K31CN6 don't work because the Reset signal is not broken out to the connector.


The real JLink dongles cost well over $500

The cheapest fully official / legal version is the JLink Edu Mini. Which Adafruit sell

https://www.adafruit.com/product/3571

[VA6GSB]

Thanks, I get the one you posted, and I agree the real one about $500.
Thanks again.
VA6GSB

[VK3KYY]

Thanks, I get the one you posted, and I agree the real one about $500.
Thanks again.
VA6GSB

FYI.

The cheapest fully official / legal version is the JLink Edu Mini. Which Adafruit sell

https://www.adafruit.com/product/3571



BTW.

The problem with the clones, is that JLink started to blacklist the serial numbers used in the cloned firmware, however if the clone you buy from Amazon doesn't work, you could send it back.

I have various clones and also the JLink Edu Mini

But, most of the time I actually use a JLink I made by modifying a $5 STM32 board, I bought from AliExpress

https://www.aliexpress.com/item/1005004530565313.html