Two points regarding RENs and REN boosters:
1) If a phone has a ringer switch (hi, lo, off), would turning it to the 'off' position effectively make the REN of that device zero?

2) Would using a REN booster have the capability of corrupting the firmware in an ADSL router/modem? I appear to have been able to use a system with 8 extensions (plus BB) with a REN booster - but with intermittent problems of losing the ADSL connection (a problem fixed by a firmware upgrade). I'm wondering whether using the REN booster was responsible for corruption the firmware upgrade?
If I can't use my REN booster, I'm hoping I can use a few of my phones with the ringers switched off and have uninterrupted BB.