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{| class="wikitable"
{| class="wikitable"
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! firmware version !! code digits !! coding scheme upgrade !! notes
! Soft version !! Program number digits !! Connection scheme upgrade
|-
|-
| <= 2017-09-01 || 3 || (no previous coding scheme) ||
| <= 2017-09-01 || 3 || XXX
|-
|-
| > 2017-09-01 and < 2018-xx-xx || 4 || XXX => 1XXX ||
| > 2017-09-01 and < 2018-01-01 || 4 || XXX => XXXX
|}
|}