the firmware folder is /storage/.config/firmware/
There is a wiki how to do it.
after reboot you should see a different version
Thank you! With your instructions, it's now finding some services using downgraded 4.0.11 firmware.
Although oddly some of the Freeview transponders are not returning anything, so I guess I'll try a few different firmwares, has anyone else got issues with some of the frequencies?
I wonder if someone would be able to offer some advice?
I recently noticed that TVHeadend is not allowing me to scan/watch any channels on DVB-T. DVB-S is still working fine. It's a dual tuner DVBSky T9580 V3. I'm not sure when this stopped working as I had not used it for a while. I am using the LibreELEC 9.2.6 x86_64, I'm using the latest nightly of TVH 4.3, and I have tried 4.2 too.
After a LOT of googling a number of people had had the same issue with the later versions of firmware dvb-demod-si2168-b40-01.fw version B 4.0.25 and I should use version 4.0.4 to 11.
So with this information, I did the following to set an earlier version.
cd /lib/firmware
mv dvb-demod-si2168-b40-01.fw dvb-demod-si2168-b40-01.fw.old
wget dvb-demod-si2168-b40-01.fw
reboot
But after a reboot and typing 'dmesg | grep si2168' is shows that the version 25 firmware is redownloaded.
[ 6.314041] si2168 13-0064: Silicon Labs Si2168-B40 successfully identified
[ 6.314045] si2168 13-0064: firmware version: B 4.0.2
[ 9.888887] si2168 13-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw'
[ 14.204480] si2168 13-0064: firmware version: B 4.0.25
[ 14.301389] si2168 13-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw'
[ 18.703310] si2168 13-0064: firmware version: B 4.0.25
Can anyone offer some advice on forcing earlier firmware versions from 4.0.4 to 4.0.11 and NOT 25?
Thanks.
I had the same issue today (not used in a while). Had to ssh and type 'emby4.start' to get it to run.
Before that I uninstalling and re-installed, but issue continues. Annoyingly I now need to setup emby again!
Does anyone know how to fix this? Thanks.
EDIT: After about 10 mins emby shut down, so am having to play moves outside of emby for now.
If anyone is interested. I installed the lamp plugin that puts a web server on port 4080, then updated the httpd.conf to use port 80. (You will need to change the Chrous port if on 80).
Lamp is available here - Index of /lamp/, install via kodi
Attached is my simple web frontend.
port had the same idea in the past, but Kodi is using port 80 so you need another port
Maybe a list at the Wiki is helpful
oh, kodi is at 8080 for me, I must have changed it ages ago and forgot 
I would find it useful to have a simple website on the default port 80 that could have some simple help details and stats etc and can be customised to forward to different web frontends for kodi, emby, tvheadend etc. I'm always forgetting the correct ports for the various installed frontends!!
Just wondering if anyone else would find this useful? 
Save the file in UNIX format (not DOS).
Thanks! that did the trick, it's now working. I ended up using the 'EOL Conversion' option in notepad++ to convert to unix format.
I hope this is a simple one. I'm very new to linux so i'm probably doing something stupid, please help 
I am currently trying to create a script to refresh my dvbsky drivers on resume, currently on resume I get 'not tuner available' error.
I have created the following script here /storage/.config/sleep.d. But on resume/sleep I get the following errors Jul 12 11:13:52 media systemd-sleep[1159]: /storage/.config/sleep.d/01-dvb.power: line 3: syntax error: unexpected word (expecting "in")
This is the script, any help would be greatly appreciated.
#!/bin/sh
case "$1" in
pre)
echo "pre" >> "/tmp/dvb-power.log"
# unload services and drivers
systemctl stop service.tvheadend42
rmmod rc_dvbsky
rmmod smipcie
rmmod m88ds3103
rmmod dvb_core
;;
post)
echo "post" >> "/tmp/dvb-power.log"
# load services and drivers
modprobe rc_dvbsky
modprobe smipcie
modprobe m88ds3103
modprobe dvb_core
systemctl start service.tvheadend42
;;
esac
