# 1.25 firmware upgrade for P15 **URL:** \ **Category:** Power Components\ **Created:** [July 14, 2019, 8:41pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765 "2019-07-14T20:41:59Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![luigi61](https://avatars.discourse-cdn.com/v4/letter/l/c57346/32.png) [@luigi61](https://forum.psaudio.com/u/luigi61)\ **Post date:** [July 14, 2019, 8:42pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/1 "2019-07-14T20:42:00Z")
I just made the firmware upgrade (available on the web site) to my new P15. The default firmware was 1.23. Does anybody knows which kind of improvements (if any) introduces this 1.25 firmware upgrade? Thanks, Luigi ---
**Author:** ![Brodric](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Brodric](https://forum.psaudio.com/u/Brodric)\ **Post date:** [July 14, 2019, 8:53pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/2 "2019-07-14T20:53:03Z")
It should be in the release notes. They said previously, all future software upgrades would have release notes listing the changes. ---
**Author:** ![luigi61](https://avatars.discourse-cdn.com/v4/letter/l/c57346/32.png) [@luigi61](https://forum.psaudio.com/u/luigi61)\ **Post date:** [July 14, 2019, 10:17pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/3 "2019-07-14T22:17:51Z")
I don’t find any release notes. Can you help me in finding them? ---
**Author:** ![Brodric](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Brodric](https://forum.psaudio.com/u/Brodric)\ **Post date:** [July 14, 2019, 10:55pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/4 "2019-07-14T22:55:02Z")
PS Audio - the Director of Engineering if I recall - said on the forum here that all future software would have release notes. @jamesh is the go-to guy for following this up. ---
**Author:** ![luigi61](https://avatars.discourse-cdn.com/v4/letter/l/c57346/32.png) [@luigi61](https://forum.psaudio.com/u/luigi61)\ **Post date:** [July 15, 2019, 7:22am UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/5 "2019-07-15T07:22:42Z")
I made a comparison between the 1.23 and the 1.25 release. It seems that the content of the 1.23 release is newest than the 1.25 release (see the dates of the .hex files on the picture) I wonder if it is possible to reinstall the 1.23 release? ![35](https://us1.discourse-cdn.com/flex015/uploads/psaudio/original/3X/a/e/aea5e07c32ee06b9a74a5580014ba16563503f02.png) ---
**Author:** ![Brodric](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Brodric](https://forum.psaudio.com/u/Brodric)\ **Post date:** [July 15, 2019, 8:02am UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/6 "2019-07-15T08:02:19Z")
> [@luigi61](#): > > It seems that the content of the 1.23 release is newest than the 1.25 release No it’s not. Since when did 21 May come before 28 March? ---
**Author:** ![luigi61](https://avatars.discourse-cdn.com/v4/letter/l/c57346/32.png) [@luigi61](https://forum.psaudio.com/u/luigi61)\ **Post date:** [July 15, 2019, 8:07am UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/7 "2019-07-15T08:07:06Z")
Yes, but it is one year later (2018 vs. 2019): see the last three files ---
**Author:** ![Brodric](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Brodric](https://forum.psaudio.com/u/Brodric)\ **Post date:** [July 15, 2019, 8:18am UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/8 "2019-07-15T08:18:22Z")
Again. No it isn’t. 125.hex is 21 May 2019. 123.hex is 28 March 2019. 1.25 is the later version. ---
**Author:** ![luigi61](https://avatars.discourse-cdn.com/v4/letter/l/c57346/32.png) [@luigi61](https://forum.psaudio.com/u/luigi61)\ **Post date:** [July 15, 2019, 10:24am UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/9 "2019-07-15T10:24:05Z")
Yes, I understand what you mean. I see that the first three .hex fils are new (otherwise I wouldn’t have made the upgrade) but I don’t understand why the last three files are dated June 2018 (ver. 1.25) instead of March 2019 (ver. 1.23) ?! But apart this particular issue, I’d like to receive an answer to my original question. ---
**Author:** ![Brodric](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Brodric](https://forum.psaudio.com/u/Brodric)\ **Post date:** [July 15, 2019, 10:28am UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/10 "2019-07-15T10:28:09Z")
@jamesh will need to follow that up. ---
**Author:** ![jamesh](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/jamesh/32/3871_2.png) [@jamesh](https://forum.psaudio.com/u/jamesh)\ **Post date:** [July 15, 2019, 2:36pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/11 "2019-07-15T14:36:30Z")
No performance upgrades in 1.25. We needed to fix a minor bug where the meters on the display would stop refreshing. ---
**Author:** ![luigi61](https://avatars.discourse-cdn.com/v4/letter/l/c57346/32.png) [@luigi61](https://forum.psaudio.com/u/luigi61)\ **Post date:** [July 16, 2019, 8:20am UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/12 "2019-07-16T08:20:21Z")
Thank you for your answer, @jamesh After the firmware upgrade to the new release 1.25, I noticed that the power meter shows an higher value compared to the one measured and showed on the status display (see the images). As a matter of facts my hi-fi system absorbs around 300 W, but the needle on the power meter actually shows 375 W. With the original firmware (I suppose it was the 1.23) the power meter indications was more precise. Does the new firmware affect the power meter scale? Is there any safe possibility to reinstall the 1.23 firmware version? ![IMG_7149](https://us1.discourse-cdn.com/flex015/uploads/psaudio/original/3X/8/a/8af64406abe32065fb9d1756cd660bc742bf4c6b.jpeg) ![IMG_7150](https://us1.discourse-cdn.com/flex015/uploads/psaudio/original/3X/5/f/5fd01ea944010b82d0926bae5c979f83292597bc.jpeg) ---
**Author:** ![Brodric](https://avatars.discourse-cdn.com/v4/letter/b/c68b51/32.png) [@Brodric](https://forum.psaudio.com/u/Brodric)\ **Post date:** [July 16, 2019, 9:04am UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/13 "2019-07-16T09:04:16Z")
> [@luigi61](#): > > Does the new firmware affect the power meter scale? You don’t want 1.23 Stay on the current version. The meter indications in 1.23 were wrongly scaled for P20 with full scale deflection being for the maximum load of P20. Therefore, when P15 is operating at its maximum load, the meter will only show a fraction of that. All this has been discussed before in the forum, several times. ---
**Author:** ![Elk](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/elk/32/1240_2.png) [@Elk](https://forum.psaudio.com/u/Elk)\ **Post date:** [July 16, 2019, 2:14pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/14 "2019-07-16T14:14:32Z")
One of the fixes in the 1.23 firmware is it makes the wattage needle in the P15 display correctly. see, [P15/P20 1.23 Firmware Live!](https://forum.psaudio.com/t/p15-p20-1-23-firmware-live/10215) I do not recall any discussion that 1.23 is scaled improperly for the P15, but I may have forgotten. Cite? By the way, luigi61 is referring to 1.25, not 1.23. His post is the first mentioning a power meter scaling issue with a P15 running 1.25. @jamesh are you aware of a power meter display issue with 1.25? Luigi61, there is no problem reloading 1.23 if you would like to do so. ---
**Author:** ![jamesh](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/jamesh/32/3871_2.png) [@jamesh](https://forum.psaudio.com/u/jamesh)\ **Post date:** [July 16, 2019, 2:30pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/15 "2019-07-16T14:30:16Z")
I’m not aware of any scaling issue with 1.25. @luigi61, can you verify you have 1.25 loaded? ---
**Author:** ![luigi61](https://avatars.discourse-cdn.com/v4/letter/l/c57346/32.png) [@luigi61](https://forum.psaudio.com/u/luigi61)\ **Post date:** [July 16, 2019, 2:44pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/16 "2019-07-16T14:44:32Z")
@jamesh yes, I confirm I have the 1.25 firmware installed (see the picture) Can you confirm that it’s possible to reinstall the 1.23 firmware without any problem? ![IMG_7145](https://us1.discourse-cdn.com/flex015/uploads/psaudio/original/3X/f/2/f25d1ac19f705e23c741a8f92af6a9ada92b312b.jpeg) ---
**Author:** ![jamesh](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/jamesh/32/3871_2.png) [@jamesh](https://forum.psaudio.com/u/jamesh)\ **Post date:** [July 16, 2019, 2:45pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/17 "2019-07-16T14:45:36Z")
Thank you. Yes, reinstalling 1.23 shouldn’t be a problem at all. ---
**Author:** ![luigi61](https://avatars.discourse-cdn.com/v4/letter/l/c57346/32.png) [@luigi61](https://forum.psaudio.com/u/luigi61)\ **Post date:** [July 16, 2019, 3:25pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/18 "2019-07-16T15:25:52Z")
Can I use the same procedure with the sd card to reinstall the 1.23 firmware? Or do I have to press “RESTORE DEFAULTS”? Thanks ---
**Author:** ![Elk](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/elk/32/1240_2.png) [@Elk](https://forum.psaudio.com/u/Elk)\ **Post date:** [July 16, 2019, 3:57pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/19 "2019-07-16T15:57:52Z")
Use the same procedure you did for installing 1.25. ---
**Author:** ![jamesh](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/jamesh/32/3871_2.png) [@jamesh](https://forum.psaudio.com/u/jamesh)\ **Post date:** [July 16, 2019, 4:07pm UTC](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765/20 "2019-07-16T16:07:20Z")
Yes, same procedure. Restore defaults refers to any settings you may have changed in the setup menu. [Next page](https://forum.psaudio.com/t/1-25-firmware-upgrade-for-p15/11765.md?page=2)