Please HelpMe Manolo

Hi guys, forgive me for my bad english. I’m on google translate. I have a Turris mox, which I have lost the original sdcard. And I make an sdcard according to the turris website, with the latest stable medkit, it installs well and starts but in a few minutes it updates removing openwrt and leaving only reforis. What could I do to have my turris mox with openwrt and update normally? That is, it updates to turris shield and I want turris mox. Thanks guys, I hope for your help.