Administrator login is disabled or just not have password for it? (If i remember good SCM does not have an option to disable administrator account, but might be wrong). I only made the script because router was reset (when was trying to change connection type from DSL to Ethernet, seems like this one not likes it, would been nice to have voip as do not think the one with WRT will ever have one (do not think 32mb will be enought for asterisk and the voip drivers alone, times even dsl driver running out of it)
sx763os trick does not work because that command need 0 uid/gid on retail boxes only administrator and root have that level of access (and root password is unknown (hopefully)), T-Com firmware might disable administrator account (though iam quiet sure they do not have password for root eighter) but that would break firmware compatibility with retail devices (think scm_app have administrator hardcoded into it quiet a few times), i do not tell script makes it easier, but if it have administrator account due to bug its password can be changed by any other subscriber/operator user, and once log on with that sx763os should give shell (that is due to firmware compatibility too).