DVSwitch and MMDVM_Bridge update via Repository (stretch)

David BV3UN

Dear All
i had install DVswitch and MMDVM_Bridge via Repository on 2019 ,now i want to want to upgrade them to last version after apt-get update ; apt-get upgrade 
it sill no new version on  Repository (stretch) ,so please tell me how can i do this upgrade 

i still in stretch .thanks 

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