Yes I have seen that. But I am new in this topic so I do not know how to start/use that script. I think somehow with the terminal in SFOS.
devel-su pkcon install zypper
RELEASE=2.0.5.6
ssu release $RELEASE
devel-su sed -i -e 's#^adaptation=.*$#adaptation=http://repo.merproject.org/obs/home:/RealJohnGalt:/testing:/hammerhead/sailfish_latest_armv7hl/#' \ /usr/share/ssu/repos.ini
ssu dr mw ssu ar mw http://repo.merproject.org/obs/nemo:/devel:/hw:/common/sailfish_latest_armv7hl/ ssu er mw
ssu lr
devel-su zypper clean -a devel-su zypper ref -f
version --dup
sync reboot
devel-su zypper in -f <last package>
version --dup sync reboot
devel-su dr adaptation0 devel-su zypper ref