diff --git a/dotfiles/investagating_firmware_bug.md b/dotfiles/investagating_firmware_bug.md
index 0ea1c88..1d5d135 100644
--- a/dotfiles/investagating_firmware_bug.md
+++ b/dotfiles/investagating_firmware_bug.md
@@ -16,6 +16,16 @@ the video freezes / lags often , usually at the same spot : 10s in, 2minutes in
 
 - next i created an image of this working recur. (known issues with the image so far : screen saver is on, our home wifi is included)
 
-- the firmware that is working is `Linux raspberrypi 4.9 59-v7+ #1047 SMP Sun Oct 29 ...`
+- the firmware that is working is `uname -a : Linux raspberrypi 4.9 59-v7+ #1047 SMP Sun Oct 29 ...`
 
-- next i will try a `sudo apt update` and `sudo apt upgrade` to rule out a package update causing the bug
+- next i will try a `sudo apt update` and `sudo apt upgrade` to rule out a package update causing the bug - can confirm its still working after apt upgrades ! must be the firmware :
+
+- the gpu firmware (not sure the exact dif..) is obtained from `sudo /opt/vc/bin/vcgencmd version` and is `Oct 24 2017 .. a3d7660e6749e75e2c4ce4d377846abd3b3be283 (clean) (release) `
+
+the new firmware says its : `754029b1cb414a17dbd786ba5bee4fc936332255` which is what i started typing into `sudo rpi-update 754029b`
+
+now `uname -a` reads `.. 4.9.60-v7+ #1048 .. Fri Nov 3` and the player still works. `sudo /opt/vc/bin/vcgencmd version` says `Nov 3 .. 1bcf9152... (clean) (release)`
+
+pushed forward to v 4.14.20 which failed. pushing back: did this a few times. got it working on 4.9.78 but failing on 4.9.80. looks like it might be this issue : https://www.raspberrypi.org/forums/viewtopic.php?t=195178 - just need to figure out how to turn it off for testing
+
+found it ! i have the lastest firmware version and by adding `audio_pwm_mode=0` to the config it now plays as before . phew what a relief !