topic Re: Downgrade UI8 to UI7 in Z Series

Downgrade UI8 to UI7

MadzE — Sat, 25 Oct 2025 17:38:57 GMT

How do i downgrade UI8 to UI7 Samsung Fold 4.

Having issues with main screen after updating, screen sometimes going black

Re: Downgrade UI8 to UI7

The-Kid-Deė — Sat, 25 Oct 2025 18:04:22 GMT

What's done has been done, there's no legally going back.

Re: Downgrade UI8 to UI7

incredibility — Sat, 25 Oct 2025 18:09:11 GMT

Why

Re: Downgrade UI8 to UI7

BrightonTakaz — Sat, 25 Oct 2025 18:42:08 GMT

Downgrading it may damage it because you will need a computer and download the firmware for android 15 one ui 7

Re: Downgrade UI8 to UI7

MadzE — Sat, 25 Oct 2025 18:44:22 GMT

My main screen on my Fold 4 is no longer working properly, sometimes black, sometimes lines, sometimes its ok.
What should i do now

Re: Re: Downgrade UI8 to UI7

Kamogelo190 — Sun, 26 Oct 2025 05:49:01 GMT

It's possible to downgrade only if your phone is Bit A(10)

Re: Downgrade UI8 to UI7

SherlockHolmes222B — Sun, 26 Oct 2025 08:38:21 GMT

Hi MadzE, I see—you’re experiencing issues with your Samsung Galaxy Z Fold 4 after updating to One UI 8, and you want to downgrade back to One UI 7. I can guide you carefully. Samsung doesn’t officially allow downgrades via standard settings, so this involves manually flashing the firmware. Warning: This carries risks (data loss, potential device bricking, warranty issues), so follow carefully.

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Step 1: Backup Everything

Downgrading will erase your device completely. Make a full backup of:

Photos, videos, documents

Samsung Cloud data

WhatsApp/other app data

Any important files

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Step 2: Download the Correct Firmware

1. Go to a trusted Samsung firmware site like SamMobile or SamFrew.

2. Find your exact model: Galaxy Z Fold 4 (SM-F936B/SM-F936U/etc.).

3. Download One UI 7 firmware for your region/carrier.

Make sure the CSC code matches your carrier or region.

You may need the AP, BL, CP, CSC files (standard Samsung firmware package).

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Step 3: Install Odin on PC

1. Download Odin.

2. Install Samsung USB drivers: Samsung USB Drivers.

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Step 4: Boot Fold 4 into Download Mode

1. Power off the device.

2. Press and hold Volume Down + Power (or Volume Down + Bixby + Power depending on model) until the download mode screen appears.

3. Press Volume Up to continue into Download Mode.

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Step 5: Flash Firmware via Odin

1. Connect your Fold 4 to PC via USB. Odin should recognize it (ID:COM box turns blue).

2. Load firmware files into Odin:

BL → Bootloader

AP → System

CP → Modem

CSC → Wipe data & reset (choose CSC file, not HOME_CSC to ensure clean downgrade)

3. Make sure Auto Reboot and F. Reset Time are checked; nothing else.

4. Click Start. Wait patiently (may take 5–10 mins).

5. Device will reboot automatically once done.

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Step 6: Set Up Device

After reboot, the Fold 4 will be on One UI 7.

Complete setup

Restore backup

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⚠️ Important Notes

Flashing with the wrong firmware or AP file may brick the device.

Downgrading will trip Knox, which affects warranty and Samsung Pay.

If the black screen persists on One UI 7, the issue may be hardware-related.

Re: Re: Downgrade UI8 to UI7

MadzE — Sun, 26 Oct 2025 08:42:34 GMT

Thank you very much, will let a software professional do the downgrade👏

Re: Re: Re: Downgrade UI8 to UI7

SherlockHolmes222B — Sun, 26 Oct 2025 08:45:24 GMT

You welcome

Re: Re: Downgrade UI8 to UI7

MadzE — Sun, 26 Oct 2025 08:46:48 GMT

I doubt if it is hardware, because if i first open an App using the front screen, and then open the main screen, everything is ok

Re: Re: Re: Downgrade UI8 to UI7

MadzE — Sun, 26 Oct 2025 08:47:35 GMT

Problems when i open the main screen first

Re: Re: Re: Re: Downgrade UI8 to UI7

SherlockHolmes222B — Sun, 26 Oct 2025 17:04:08 GMT

Well If your Fold 4’s main screen only goes black when opening it first (without touching the front screen first), that points strongly to a software issue, most likely One UI 8 firmware or compatibility bugs, rather than a hardware problem. Hardware problems usually cause black screens regardless of which screen you start with.

In fact, this is consistent with other reports for Fold 4 users on One UI 8 experiencing main display glitches, black screens, or flickering, especially after updating.

In this case, downgrading to One UI 7 is likely to fix it, because One UI 7 is stable for the Fold 4 and doesn’t have this specific bug.

Re: Re: Re: Re: Re: Downgrade UI8 to UI7

MadzE — Sun, 26 Oct 2025 17:35:46 GMT

Thank you 🙏