diff --git a/.testbed/labgrid/default.yaml b/.testbed/labgrid/default.yaml
index 210a688fa8..701934da39 100644
--- a/.testbed/labgrid/default.yaml
+++ b/.testbed/labgrid/default.yaml
@@ -279,7 +279,9 @@ targets:
         init_commands:
           - setenv serverip 192.168.1.2
           - setenv ipaddr 192.168.1.1
+          - setenv lcm_data_block_start 0xf6800
           - setenv fullimage prplos-intel_x86-lgm-PRPL_OSP_TB341-osp_tb341_fullimage.img
+          - mmc dev 0 && mmc erase ${lcm_data_block_start} 0x400
           - mmc dev 0 && mmc erase ${rootfs_data_block_start} ${rootfs_data_block_size} && run update_fullimage
       UBootStrategy: {}