Hi,
1) IIO device numbers are never static - by design you have to look them up by name.
2) We used to chmod all the device and sysfs files for you.
If you want the previous behavior simply restore:
chmod a+rw /dev/iio:device* 2> /dev/null || true
chmod a+rw /dev/video* 2> /dev/null || true
chmod a+rw /sys/bus/iio/devices/iio:device*/* 2> /dev/null || true
chmod a+rw /sys/bus/iio/devices/iio:device*/buffer/* 2> /dev/null || true
chmod a+rw /sys/bus/iio/devices/iio:device*/scan_elements/* 2> /dev/null || true
chmod a+rw /sys/bus/iio/devices/iio:device*/trigger/* 2> /dev/null || true
chmod a+rw /sys/bus/iio/devices/trigger*/* 2> /dev/null || true
chmod a+r /sys/bus/i2c/devices/*/eeprom 2> /dev/null || true
chmod a+rw /sys/bus/platform/devices/*.axi-jesd204b*/* 2> /dev/null || true
in the /etc/rc.local file.
3) This means that there is currently no update available.
-Michael