ET200iSP IM152-1 : no initialization

Hello,

I'm in trouble with two ET200iSP IM 152-1 modules that won't boot: all leds stay on. And the devices are not reachable on the Profibus network.

According to the manual when:

on on on on

Meaning =  Hardware test after power on.

PS1 is also lit.

I've tried a few things: electrical reboots, changing the DP address (including no address), booting with no memory card, booting without Profibus cable, swapping the two modules on each other's rack: no result. 

I went back to the office and tried one of those modules on a ET200iSP rack that is functioning: the module won't initialize.

The reference is 6ES7 - 152-1AA00-0AB0. VP L4, Ex R8RBX

Can this be a faulty batch?