CRT SS 7900 - SOFTWARE

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4cc3ss
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CRT SS 7900 - SOFTWARE

Post by 4cc3ss »

Myself got a 7900 the other day then i came across the software, so i spent today with my head in assembly.

Now you are able to enter frequencies beyond the original software.

Check the photos.




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SgtBilko302
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Re: CRT SS 7900 - SOFTWARE

Post by SgtBilko302 »

If you change the drop down box from HF to CB you will see the coverage of the radio.

25.615 - 30.105.

I have DAT files already made if you want any. Just PM me your email.

Paul
Alan Pilot
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Re: CRT SS 7900 - SOFTWARE

Post by Alan Pilot »

First picture showing you have put some strange numbers in.
They should show channels with 10kc steps ie 27.555 next up would be 27.565 and so on.
4cc3ss
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Re: CRT SS 7900 - SOFTWARE

Post by 4cc3ss »

With a quick update ive been able to use ss7900 running,
@ 21mhz, i'm sure it'll still function below the tried freq.

Up to now you can't go beyond 31.150mhz, with this simple hack, the freq limits will be coded within firmware for sure, it's odd that it allows you to program a lower freq which is out of specs.



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SgtBilko302
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Re: CRT SS 7900 - SOFTWARE

Post by SgtBilko302 »

Alan. I think what he is saying is that he has hacked the ss7900 software and you can now enter these frequencies into it. But i don't think the radio will go up or down to the ones in the pic.

Would be nice if he could confirm his findings.

Paul.
4cc3ss
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Re: CRT SS 7900 - SOFTWARE

Post by 4cc3ss »

Myself can create a video later for you guys showing rx/tx,
Been out of band.
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Re: CRT SS 7900 - SOFTWARE

Post by 4cc3ss »

The biggest problem with all this, not having the firmware, myself was planning on getting renesas e8a emulator and see it be possible to extract the firmware from the mcu.

Whats the chances they protected the code when building these radio's.

Firmware = full control over the radio.

The board as a 4 pin header next to the mcu, not metered,
This yet so not 100% confirmed.

Emailed crt france for source code or fw, can see this leading to nothing.
Last edited by 4cc3ss on 31 Jul 2021, 08:02, edited 4 times in total.
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Re: CRT SS 7900 - SOFTWARE

Post by Alan Pilot »

Right i am with you Paul.
Don't think it will go anyway near to be honest but you don't know till you try.
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Re: CRT SS 7900 - SOFTWARE

Post by astradyne »

4cc3ss wrote: 31 Jul 2021, 07:27 Myself can create a video later for you guys showing rx/tx,
Been out of band.
I'm sure a few members have one of these radio's (myself included) and would be keen to know how this is achieved.
Never, ever, ever....bloody anything ever!

Far too many radio's to list here. But I do own a legal one...
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SgtBilko302
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Re: CRT SS 7900 - SOFTWARE

Post by SgtBilko302 »

Its ok having a picture of the radio on 21mhz but is it tx / rx cleanly. Would be very keen on a copy of the software if the radio works on the frequencies stated.
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Re: CRT SS 7900 - SOFTWARE

Post by 4cc3ss »

I've just got round to wiring up after finding freq counter,
Arrgghh... after programming 4 channels from 10 - 24mhz,
The tx is the original freq ie..25mhz, i even write protected the eeprom to stop any comms between the mcu, the 4 pin header is used for comms.

The firmware needs extracting to open up the radio, ive emailed a guy to see what hardware is needed as he got beyond the security when retrieving the code from a R5F212A8 mcu, and crt france operate between mon -fri.

Yep i'm gutted but not given up.
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4cc3ss
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Re: CRT SS 7900 - SOFTWARE

Post by 4cc3ss »

I've just got round to wiring up after finding freq counter,
Arrgghh... after programming 4 channels from 10 - 24mhz,
The tx is the original freq ie..25mhz, i even write protected the eeprom to stop any comms between the mcu, the 4 pin header is used for comms.

The firmware needs extracting to open up the radio, ive emailed a guy to see what hardware is needed as he got beyond the security when retrieving the code from a R5F212A8 mcu, and crt france operate between mon -fri.

Yep i'm gutted but not given up, sorry to get your hopes up.
Don't fix it unless it's broken.
4cc3ss
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Re: CRT SS 7900 - SOFTWARE

Post by 4cc3ss »

Alan Pilot wrote: 31 Jul 2021, 10:33 Right i am with you Paul.
Don't think it will go anyway near to be honest but you don't know till you try.
Absolutely, thats what it's all about trying, things started slow when i was working on the Nikon camera 4cc3ss,
Then patches was released to the world.

I've just invested in a programmer for the mcu in these radio's and a ss6900 set, so quest starts for mcu flash. :thumbup:
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Re: CRT SS 7900 - SOFTWARE

Post by SgtBilko302 »

Hope it works. Would be nice to see if / how these radio's work further down the frequency chart.

Paul.
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Re: CRT SS 7900 - SOFTWARE

Post by 4cc3ss »

SgtBilko302 wrote: 31 Jul 2021, 15:24 Hope it works. Would be nice to see if / how these radio's work further down the frequency chart.

Paul.

Myself was really surprised to see no one had attempted to break these sets wide open, sure they will go beyond their set freq, and its that what will drive me to get an answer.


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