device-mode switching doesn't work in 7.11.2

RouterOS General
1

Amongst my many RBs I also have an old one, an RB750GL.
Was sitting on the shelf for many years as some old backup, but hasn’t seen much usage. Not I’ve put it to use in my home network.

Today I cleaned the dust off of it and decided to upgrade to ROS v7. I noticed a much higher RAM usage (well, not unexpected).
Knowing that with ROS v7 one can’t install individual packages I was reading about device-mode. Great: I went ahead and tried to change to “home” to turn off most unneeded features, to see if I get some more RAM out of it.

Turns out, on this device at least, “it won’t bugde”.
I try to to this:

[admin@MikroTik] > system/device-mode/update hotspot=no socks=no l2tp=no ipsec=no 
email=no pptp=no proxy=no romon=no smb=no zerotier=no
  update: please activate by turning power off or pressing reset or mode button 
          in 4m52s
-- [Q quit|D dump|C-z pause]

Or this (it doesn’t matter what I try):

[admin@MikroTik] > system/device-mode/update mode=home sniffer=yes 
  update: please activate by turning power off or pressing reset or mode button 
          in 4m54s
-- [Q quit|D dump|C-z pause]

This device has a reset button. When I press it, nothing happens.
Tried to power it off, but after reboot it stays in the same mode as before. No change.

ROS v7.11.2, routerboard firmware upgraded as well to same version. RB750GL.
Seems like I can’t switch device-mode. I haven’t tried on any of my other routers, but, it looks like a software issue.

Edit:
Device is clean, this is all the config I have, nothing more:

[admin@MikroTik] > export compact 
# 2023-10-02 01:17:44 by RouterOS 7.11.2
# software id = CS63-1W5B
#
# model = RB750GL
# serial number = 2C5E02AFB6D8
/interface bridge
add name=bridgeLAN
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/interface bridge port
add bridge=bridgeLAN interface=all
/ip neighbor discovery-settings
set discover-interface-list=!dynamic
/ip dhcp-client
add interface=bridgeLAN
/system clock
set time-zone-name=Europe/Zagreb
/system note
set show-at-login=no
/system ntp client
set enabled=yes
2

When I was testing setting device mode when it was introduced, the button press didn’t work either. Unplugging power plug did the trick though.

3

Same issue here on hap ac mipsel, but can’t change it back to the Enterprise mode.
It means that I was able to change mode to home. but once.