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08-10-2019, 07:14 AM   #1
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K10D Firmware downgrade 1.31 to 1.20

Hi,

I have a 16-50 with failing SDM and instead of going MF on my K3II i thought it would be a good opportunity to take the K10 for a drive.
Unfortunately it has been upgraded to fw 1.31 and I would like to get back to 1.20 (pre-SDM).


I realize I'm late to the party and all links to hacked fw are long dead.
Do any of you have a hacked F/W that will allow me to go back to the official 1.20?

Thanks!

08-10-2019, 07:56 AM - 1 Like   #2
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Instead of downgrading your K10D firmware, you may consider to convert your 16-50 to screw drive. That way, you can have AF on both your K3II and K10D. Search the forums here - there's plenty of information and doing so is easy since you have K10D. Some members can even do so for you with a fee.
08-10-2019, 08:30 AM   #3
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QuoteOriginally posted by hyyz Quote
Instead of downgrading your K10D firmware, you may consider to convert your 16-50 to screw drive. That way, you can have AF on both your K3II and K10D. Search the forums here - there's plenty of information and doing so is easy since you have K10D. Some members can even do so for you with a fee.
Good advice.

If you still want to downgrade will a camera reset go back to original firmware ? I do have the 1.2 firmware update file.
08-10-2019, 09:11 AM   #4
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Here's the link to convert your 16-50 to screw drive so you don't have to mess with firmware: How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8 - PentaxForums.com

You can use your K10D to do the conversion so the lens works on all cameras.

08-10-2019, 10:11 AM   #5
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Download it from Ricoh EU

Pentax K10D - Downloads - RICOH IMAGING EUROPE S.A.S
08-10-2019, 10:18 AM   #6
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Thanks for the advice, I have considered the screw drive conversion for the lens, and it does sound like a way forward.
However, after some consideration I plan will have the lens properly fixed at a later time but the turnaround time is too long right now.
I also want to keep the K10 in screw drive mode from this point on for redundancy, while having SDM available for other cameras.

I would prefer to fix the camera F/W, If someone still have hacked f/w that will allow me to download the 1.20 (since downloading 1.20 directly on 1.31 is not allowed (have also tried with the other official f/w revisions available))

Thanks
08-10-2019, 11:31 AM   #7
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As I understand it you need a hex editor and change the header in the 1.20 file to 1.31. Save it as a binary file and load it from the SD card as usual.

I think from the K-5 on you could load lower versions without having to do this.
08-10-2019, 03:25 PM   #8
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Again, thanks for your suggestion!
Tried to download F/W with edited header to match 1.31, but sorry to say, my camera does not accept this edited file.

08-10-2019, 03:46 PM   #9
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QuoteOriginally posted by magho Quote
I realize I'm late to the party and all links to hacked fw are long dead.
Do any of you have a hacked F/W that will allow me to go back to the official 1.20?
I have a copy of the v1.20 self-extracting zip if your are interested in doing the hack yourself. Private message me if you are interested.


Steve
08-10-2019, 04:51 PM - 3 Likes   #10
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Thanks, but I have all the released files.

Was about throw in the towel, but gave it a last try.

Instead of only replacing the 1.10 with 1.31 in the header, I copied the whole(?) header from the 1.31 F/W and pasted into the 1.10 F/W (see image below) and this seemed to do it for the camera. After downloading the F/W the camera reported to have 1.31, but downloading the official 1.10 and then 1.20 was possible.



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