Firmware update failed in brand new Steam Machine

[thienbaont]

Your system information

• Steam client version: 1782861641
• SteamOS version: 3.8.14 Build 20260703.1
• Opted into Steam client beta?: [Yes/No] No
• Opted into SteamOS beta?: [Yes/No] No
• Have you checked for updates in Settings > System?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

Updating firmware for a brand new Steam Machine failed with the error message:

/esp does not have sufficient space, required 68.2 MB, need additional 3.2 MB

(deck@STEAMDECK ~)$ lsblk -o NAME,SIZE,FSTYPE,PARTLABEL,MOUNTPOINTS
NAME         SIZE FSTYPE PARTLABEL MOUNTPOINTS
zram0        7.6G swap             [SWAP]
nvme0n1      1.8T                  
├─nvme0n1p1   64M vfat   esp       /esp
├─nvme0n1p2   64M vfat   efi-A     
├─nvme0n1p3   64M vfat   efi-B     /efi
├─nvme0n1p4    5G btrfs  rootfs-A  
├─nvme0n1p5    5G btrfs  rootfs-B  /
├─nvme0n1p6  256M ext4   var-A     
├─nvme0n1p7  256M ext4   var-B     /var
└─nvme0n1p8  1.8T ext4   home      /var/log
                                   /var/tmp
                                   /var/lib/systemd/coredump
                                   /var/lib/steamos-log-submitter
                                   /var/lib/docker
                                   /var/lib/flatpak
                                   /var/cache/pacman
                                   /srv
                                   /opt
                                   /nix
                                   /root
                                   /home

Steps for reproducing this issue:

1. Open Discover
2. Go to Updates tab
3. Click on Update All