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Just reloaded from scratch on one of the boxes.
Box is Raspberry PI 2 with HiFiBerry Digi+ connected via LAN
1. Win32DiskImager to put m2p_rpi_default_244_wps_ap_expand.img to MicroSD card
2. Insert card and reinsert power lead
3. Login to http://max2play
4. Select HiFiBerry from prompt window, driver installs
5. Select Digi+ on HiFiBerry tab and save
6. Switch to Raspberry Settings tab, no GPU memory size displayed, cannot see debug info
7. Switch to Settings/Reboot tab
8. Activate with email address
9. Switch to Raspberry PI Settings tab, GPU memory reported as 128, DEBUG Information visible
10. Change GPU ram setting from 128 to 16 and Save
11. Reboot needed message displayed, but GPU ram setting reading 128 again
12. Switch to Settings/Reboot tab
13. Reboot
14. GPU ram still set to 128
DEBUG Information from Raspberry Settings
=============================================================================================================================================
#### BOOT CONFIG TXT ####
# For more options and information see
# http://rpf.io/configtxtreadme
# Some settings may impact device functionality. See link above for details
# uncomment if you get no picture on HDMI for a default „safe“ mode
#hdmi_safe=1
# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1
# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16
# uncomment to force a console size. By default it will be display’s size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720
# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1
# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4
# uncomment for composite PAL
#sdtv_mode=2
#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800
# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on
# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi
# Additional overlays and parameters are documented /boot/overlays/README
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
gpu_mem=128
dtoverlay=hifiberry-digi
=============================================================================================================================================