Yes you can upgrade to 4020 for older units. This will not cause battery drain.
Then after you have upgraded your gateway you can upgrade to 5238.
You can download it from here http://rnsfirmware.com/downloads/RNS...38_60_35_5.iso
There are only minor differences but it is the most stable and up to date firmware available.
Then after you have upgraded your gateway you can upgrade to 5238.
You can download it from here http://rnsfirmware.com/downloads/RNS...38_60_35_5.iso
There are only minor differences but it is the most stable and up to date firmware available.
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