Firmware release R2.43 for DAS-3248DC rev.B1

Release notes:
1. DSP code has been changed to version "E.67.1.114".
2. "DSL Interface is Locked Up issue": fixed.
3. "Commit" issue (not enough memory): fixed.
4. IRL issue (doesn't work exactly): fixed.
5. MAC issue (appearing of default MAC addresses after f/w upgrade): fixed.