Explanation
What this error means
SU-30746-0 means the system software update didn’t complete. The PS4 downloaded or read an update file that failed verification, usually because the transfer was interrupted or the file is damaged. It’s an update-process error, not evidence the console is broken.
Official reference: Sony support page for SU-30746-0
Diagnosis
Most likely causes
| Cause | How likely | Fixable at home? |
|---|---|---|
| Update download interrupted or corrupted | Very likely | Yes — retry the update |
| Unstable internet during the download | Likely | Yes — go wired |
| Sony’s update servers busy on patch day | Possible | No — wait and retry |
| Damaged USB file during a Safe Mode update | Possible | Yes — re-download to USB |
Repair
How to fix it
Ordered easiest-first. Try the next step only if the error comes back.
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Retry the update
Settings > System Software Update. A second attempt clears most transient failures, especially right after a major release when servers are busy.
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Switch to a wired connection
Plug in a LAN cable if you can. System updates are large and verify against a checksum, so packet loss on weak Wi-Fi corrupts them repeatedly.
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Update from Safe Mode
Power off, hold the power button to the second beep, connect the controller by USB, and choose “Update System Software” > “Update Using Internet”.
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Update via USB
On a PC, download the full update from playstation.com onto a FAT32 USB stick at PS4/UPDATE/PS4UPDATE.PUP, then use Safe Mode > Update System Software > Update from USB Storage Device.
⚠ Only use the official update file from playstation.com. The “full” reinstall file and the smaller “update” file are different — for this error use the standard update, not the reinstallation file, to avoid wiping data.
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Free up space and retry
If internal storage is nearly full, delete a game or two — the update needs working room to unpack.
Escalation
When it's not your fault
Signs the problem is on Sony's side — or in the hardware — rather than anything you can change:
- The PlayStation status page shows maintenance or degraded services during the failure.
- The same update fails on a wired connection with otherwise normal internet.
- Social feeds light up with the same update failing on patch day.
Questions
FAQ
Is it safe to turn the PS4 off after this error?
Yes. A failed update doesn’t leave the console half-installed — it verifies the file before switching over, so the current system software keeps running.
What’s the difference between the update file and the reinstall file?
The update file (around 1 GB) patches your current software and keeps data. The reinstallation file (5+ GB) wipes everything. For SU-30746-0, use the update file unless support tells you otherwise.
Why does Wi-Fi keep failing here?
Large updates verify against a checksum; a single corrupted packet on a weak wireless link fails the whole file. A wired connection removes that variable.