Turris Mox does not enter rescue mode anymore

Hi,

One of my Turris Mox does not enter rescue mode when pressing the button when plugged. It used to work and the button as effect because when I press it when already turned on, it reboots.
It happened after an update to TurrisOS 5.1.5 e29002471734dbba927d43f0b23818ddc5f551a7 from the original version (I did a factory reset just before).

Since the update has some issue, I want to do a flash from the internet.

It started working again. I don’t know what happened. I have 12 Turris Mox, first time such thing happens.