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Old 03-23-2009, 04:58 PM
Draksyl Draksyl is offline
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Join Date: Mar 2009
Posts: 6
Default Additional U1 Firmware Versions (2.1, 3.12) - PLEASE ADD TO FIRMWARE STICKY!

Posting this here as I finally found how to get a FULL upgrade path for my YP-U1 from the old 4-file based Sigmatec drivers to the new 6-file based Sigmatec drivers. (The YP-U1 uses a Sigmatec 3500 as its Digital Sound Processor).

I also managed to uncover a problem with the Removable Media Bit setting on my MP3 player while I was at it....... which had previously stopped me upgrading.

Sooooo for anyone else tearing their hair out trying to upgrade from firmware 2.x to install the Korean 3.150 firmware with SRS-WOW here is how to do it:


1) Download the v2.1 firmware from the following site:

(It is listed as 'YP-U1 Driver Program' from the Spanish region)

2) Download the v3.12 firmware from the following site:

(It is listed as 'YP-U1 Firmware Upgrade' from the Spanish region)

3) Download the v3.150 firmware linked in the sticky thread.


Congratulations, you now have all the necessary files for a full upgrade path.

Full upgrade path = v2.1 -> v3.12 -> v3.150

You *CANNOT* install directly from v2.x firmware to v3.15.
You *HAVE* to use the 3.12 firmware as an intermediate step.

If you flash your YP-U1 in the order listed above you should manage to upgrade to the version with SRS-WOW.

(For the technical people the 3.12 drivers allow the succesful transfer from the 4-Binary file old style sigmatec drivers to the 6-Binary file new driver format. This is why you cant just install the 3.150 drivers directly on all players as the 3.150 updater expects an existing 6-file firmware version).

Linky to info on Sigmatec firmware formats:

NOTE: Can someone post the following link to the v2.1 and v3.12 firmware revisions on the firmware sticky as these files are VERY hard file to find by googling or through a random search:




Despite having the firmware versions listed above my MP3 player would not upgrade at all until I reset the Removable Media Bit flag on the device.

I used BootIt.exe, downloaded from the following site:

WARNING: You only need insert the MP3 player, run BootIt ONCE and then click the 'Flip Removable Bit' button. DO NOT use the format command - purely as the version I downloaded crashed under XP and Vista. However forcing the Removable Media Bit to flip seemed to be the additional step I needed to get the firmware installed.


Hopefully all this will be of use to those people who are still having problems upgrading their U1 to the latest firmware.

If anyone has any further questions then let me know and I will check back from time to time


Last edited by Draksyl; 03-24-2009 at 02:06 AM.
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