OSSC Classic firmware v1.20
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Tagged: ossc classic firmware update
- This topic has 27 replies, 14 voices, and was last updated May 2, 2026 at 7:13 PM by
ChertolyasII.
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February 16, 2026 at 11:15 PM #68696
the resolution changes to 525i and the signal drops
When you say the signal drops, does it drop on the OSSC (the LCD display shows no sync or some garbage value) or only on your display?
February 16, 2026 at 11:57 PM #68697The signal only disappears on the TV; the OSSC continues to function and display information. The information displayed is: AV1_RGBS 525-i 15.73kHz 59.94Hz
February 17, 2026 at 6:13 AM #68701Does this newer firmware work on the Mcbazel OSSC ver 1.6, if it is modded with the wire mod?
February 17, 2026 at 7:46 PM #68709A small step forward with my problem: I’ve managed to get the black screen to display something. I had to disable “ultra hd deep color” on my LG UH8500 TV. Now it shows the image, but it’s duplicated in two parts on the screen.
Images:
https://drive.google.com/file/d/1OKRtVWbaF7Re8lyqE3349kjAO98WY8cR/view?usp=drivesdk
https://drive.google.com/file/d/1MvbLvSFMJGF3YjYwzSEsoVDvvQ55LuwA/view?usp=drivesdk
https://drive.google.com/file/d/1XZUHOld4m6q74lxc27eVrTMolH8aq7Ow/view?usp=drivesdk
https://drive.google.com/file/d/18SZRg9_uI3-oJgA2NW0hKgdGomKviY_4/view?usp=drivesdk
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This reply was modified 3 months ago by
Angelgdl.
February 17, 2026 at 7:54 PM #68711As far as I know nothing was changed with interlace handing lin 1.20, is there a way to tell what signal the TV thinks it is getting?
February 17, 2026 at 8:05 PM #68712The information displayed on the screen is limited, but it does say that the image resolution is 1024×490.
https://drive.google.com/file/d/14mHCn_Xy4bdl8d0DgCVbUTqqW5EabfRG/view?usp=drivesdk
February 17, 2026 at 9:32 PM #68714Interesting, and you have tried a full settings reset?
February 17, 2026 at 10:09 PM #68715Hey, good tip! I applied it in OSSC and it worked. I reset the profile and it fixed it. I think there must be a conflict between the optimal timming profiles for FirebrandX on N64 and this new firmware. I should clarify that I converted them on the website for this new firmware, so I don’t know what the conflict could be, but at least the reset profile worked for me. In case anyone else has the same problem, this is the solution.
Thank you so much for your support, it was truly very helpful.
Update: After turning OSSC off and on again with the default profile, the split-screen issue occurred again. The solution was the same: reset the profile. However, I found that when I re-enabled the shadow mask, the screen went black. Another issue with this strange bug is that when I reset the profile and everything returns to normal, the resolution shows 480p, but in the “line multi-option” menu, trying to change the 480p line doesn’t do anything; it has no effect on any of the options.
https://drive.google.com/file/d/1JOPaKbva5NsDGzH7SWlhsyHhPVszeW1K/view?usp=drivesdk
March 31, 2026 at 9:35 PM #69058Hello, new Member – old OSSC User here.
I never updated my OSSC since I get this nice device and used Firmware 0.86 for many years. Now I have updated to v1.20 and my OSSC stopped working. For every input I can’t get a Sync (just a black screen with the “No Sync” message on the OSSC-Screen). I can’t downgrade to an older firmware as well. I put an older Firmware bin-File in an fw folder on my 16GB SD-Card is used for the upgrade, but my OSSC only says “No fw/*.bin file found”. Any help would be very appreciated. Thank you!
March 31, 2026 at 11:40 PM #69059Did you do the hardware modification required for the 1.x branch firmware? You must do this modification if you have an older OSSC (hardware revision 1.7 or earlier). Follow the specific firmware upgrade/downgrade instructions for 1.20 to downgrade (firmware file goes in fw sub-folder on fat32 formatted card).
April 1, 2026 at 9:01 AM #69063No – that was my mistake. After the 5th time formatting the SD Card (the mac disk utility software seems not to work properly for fa32 formatting), now with a third party software, i could manage to downgrade to v0.7. Now everything is working fine again. Thank you!
April 13, 2026 at 6:38 PM #69159Same problem, I used a folder name fw and that downgraded the firmware but the problem remained even after reverting to original firmware even restored my profiles and no joy blank screen and no Sync on all consoles, anyone else had this problem or found a solution?
May 2, 2026 at 7:13 PM #69337Hello, Marqs! I want to say thank you so much for OSSC! The latest updates are particularly pleasing: it is now very convenient to update and upload profiles. I also like the XC-3315C mask – it gives the most uniform image for Genesis.
And I will share my profiles for Genesis, Mega Drive PAL and Dreamcast (for fw v1.20, 1.21):
https://disk.yandex.ru/d/MEMFV8CCJ3xwaAprof00.bin (Default) – default settings OSSC
prof01.bin (MD NTSC 5x) – for NTSC Mega Drive / Genesis
prof02.bin (MD320 PAL 3x) – for Mega Drive PAL and games 320x240p
prof03.bin (MD256 PAL 3x) – for Mega Drive PAL and games 256x240p
prof04.bin (Dreamcast) – for Dreamcast (VGA)For Genesis, I managed to make a single Line5x profile for 320p and 256p in 4:3 format – scanlines+mask, correct operation when switching to 480i in Sonic 2 and Combat Cars. Unfortunately, I was unable to find a single 4:3 profile and setup for Line5x for Mega Drive PAL, so there are two separate Line3x profiles for 320p and 256p with simplified scanlines. And for the Dreamcast, I use Line2x and minimalistic scanlines, and I think it looks great)
And some sample images for Genesis)

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This reply was modified 3 weeks ago by
ChertolyasII.
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This reply was modified 3 weeks ago by
ChertolyasII.
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This reply was modified 3 months ago by
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