GL-S1300 not updated

While for GL-B1300 Convexa-B updates are pretty frequent for GL-S1300 Convexa-S seems to standstill on 4.3.13 Is there any particular reason why GL-S1300 Convexa-S is not getting firmware updates?

Hi,

S1300 is EOL, but GL also will release the newer firmware if there are major security breaches.