Preset pages still radomly resets to 2 after upgrade tp 3.4.23188

Ford SYNC 3 Support CyanLabs Update Support
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1

Before upgrading, I was experiencing an issue where my preset pages would reset from 4 back to 2. When this occurred, I also noticed that Android Auto / CarPlay would reset and require full setup again.

After researching, I found reports of a bug related to the /fs/rwdata/ partition filling up. I confirmed this using the Interrogator USB, ran the RW Data Cleaner USB, and then upgraded to version 3.4.23188.

I expected the upgrade to resolve the issue, but the preset pages are still resetting.

Below is the Interrogator log captured immediately after the presets reset:

APIM Model: 5U5T-14G371-CMD
APIM Type: Navigation
APIM Size: 32GB
APIM Free Space: 4.7G
Version 3.4.23188 (NU5T-14G381-AD)

3/23/2026 2:29:16 AM +00:00

Partition Type = Free / Total
/fs/sd/MAP/ = 12M / 1.4G
/fs/sd/MAP/ = 36K / 1.4G
/fs/sd/MAP/ = 148K / 1.4G
/fs/sd/MAP/ = 12M / 1.3G
/fs/sd/MAP/ = 3.0M / 922M
/fs/sd/MAP/ = 9.3M / 1.3G
/fs/sd/MAP/ = 16M / 1.7G
/fs/sd/MAP/ = 16M / 1.7G
/fs/sd/MAP/ = 13M / 2.0G
/fs/Nuance/ = 15M / 1.6G
/fs/Nuance/ = 10M / 1.1G
/fs/Nuance/ = 24M / 2.6G
/fs/Nuance/ = 3.2M / 465M
/fs/rwdata/ = 12M / 1.2G
/fs/rwdata/quip/ = 35M / 35M
/fs/rwdata/quip/ = 88M / 90M
/fs/mp/ = 84M / 1.4G
/fs/images/ = 4.7G / 25G

Installed Packages
5U5T-14G391-CS
4U5T-14G421-CAC
4U5T-14G421-CBC
4U5T-14G421-CCC
4U5T-14G421-CDC
4U5T-14G421-CEC
4U5T-14G421-CFC
4U5T-14G421-CGC
4U5T-14G421-CHC
4U5T-14G421-CJC
4U5T-14G422-CAF
4U5T-14G422-CBF
4U5T-14G422-CCF

APIM AsBuilt
DE00: 2A0A01020802690C048A
DE01: 55531204800A4490A8B44405
DE02: 0006000200
DE03: 000001900B0001
DE04: 1ABD1AA42E85
DE05: 10
DE06: 1A003300000000753000005656940076

SYNC Region: NA

Navigation Variant: Nav

Manufacturer Year: MY20

Install Type: OEM

Old SYNC Version: 3.4.20136

New SYNC Version: 3.4.23188

Do you have a error message, if so what is it?
N/A

Update Method: CyanLabs Syn3 Updater

Syn3 Updater Version: 2.14.2.0

Syn3 Updater Documentation Read: yes

Syn3 Updater Log File

N/A -- USB wiped after uprgrde
2

The RWDATA still is low, do a master reset and run the RWDATA cleaner again afterwards.

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3

Ok, thank you!! I’ll do it and report back.

4

I did a master reset, confirmed all settings were wiped out. I ran the RWDATA cleaner and power cycled. This is the interrogator log after that power cycle:

VIN: **
APIM Model: 5U5T-14G371-CMD
APIM Type: Navigation 
APIM Size: 32GB 
APIM Free Space: 4.7G 
Version 3.4.23188 (NU5T-14G381-AD)

3/25/2026 1:30:46 AM +00:00

Partition Type = Free / Total
/fs/sd/MAP/ = 12M / 1.4G
/fs/sd/MAP/ = 36K / 1.4G
/fs/sd/MAP/ = 148K / 1.4G
/fs/sd/MAP/ = 12M / 1.3G
/fs/sd/MAP/ = 3.0M / 922M
/fs/sd/MAP/ = 9.3M / 1.3G
/fs/sd/MAP/ = 16M / 1.7G
/fs/sd/MAP/ = 16M / 1.7G
/fs/sd/MAP/ = 13M / 2.0G
/fs/Nuance/ = 15M / 1.6G
/fs/Nuance/ = 10M / 1.1G
/fs/Nuance/ = 24M / 2.6G
/fs/Nuance/ = 3.2M / 465M
/fs/rwdata/ = 13M / 1.2G
/fs/rwdata/quip/ = 35M / 35M
/fs/rwdata/quip/ = 90M / 90M
/fs/mp/ = 84M / 1.4G
/fs/images/ = 4.7G / 25G

Installed Packages
5U5T-14G391-CS
4U5T-14G421-CAC
4U5T-14G421-CBC
4U5T-14G421-CCC
4U5T-14G421-CDC
4U5T-14G421-CEC
4U5T-14G421-CFC
4U5T-14G421-CGC
4U5T-14G421-CHC
4U5T-14G421-CJC
4U5T-14G422-CAF
4U5T-14G422-CBF
4U5T-14G422-CCF

APIM AsBuilt
DE00: 2A0A01020802690C048A
DE01: 55531204800A4490A8B44405
DE02: 0006000200
DE03: 000001900B0001
DE04: 1ABD1AA42E85
DE05: 10
DE06: 1A003300000000753000005656940076

Sync_WZ82FZ90_1FMSK8DH2LGC25819.xml (11.0 KB)

5

If you ran the rwdata cleaner and performed a master reset, that’s not good since it’s not clearing it up. It’s very strange to see the master reset succeeding but not erasing that.

If I were you, I would start considering jailbreaking(*) the unit so that you could reformat it with FMODS’ universal reformat package, that can handle MY20 hardware.

(*)we do not support jailbreak

6

I’ve seen something like this before.

Downgrade to 3.4.21265 (which is before the RWData bug was introduced), do a master reset, run the RWData cleaner again by itself, then run the interrogator.

If its clean, update to 3.4.23188

1 Like