Nec Sl1000 Firmware Upgrade ((link)) -

Use a low-capacity card (2GB to 32GB is ideal). It must be formatted to the FAT or FAT32 file system. The SL1000 cannot read NTFS or exFAT formats. 3. PC and Software Tools

: Open the sub-cover of the Main KSU. Press and hold the S1 switch while turning the AC Power Switch ON .

Upgrading your PBX firmware is much more than just getting the latest version number. Regularly updating your NEC SL1000 provides several critical benefits:

Browse and select your downloaded firmware file on your computer.

Click the Maintenance (wrench icon) button and select Software Update from the left sidebar.