Librem coreboot Utility Script: usage, discussion, and help

I have Librem 14 with coreboot/seaBIOS and when I do sudo bash ./coreboot_util.sh in order to update firmware using precompiled images (either coreboot/seaBIOS or coreboot/Heads) I get Unhandled programmer parameters: ich_spi_mode=hwseq.

Here’s the full log:

flashrom v1.2 on Linux 5.10.0-6-amd64 (x86_64)
flashrom was built with libpci 3.7.0, GCC 9.3.0, little endian
Command line (7 args): /usr/sbin/flashrom -p internal:ich_spi_mode=hwseq -w ./firmware/pureboot-librem_14-Release-17.1.rom -V -o ./flashrom-20210520-194517.log
Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Initializing internal programmer
/sys/class/mtd/mtd0 does not exist
Found candidate at: 00000500-00000528
Found coreboot table at 0x00000500.
Found candidate at: 00000000-000004c4
Found coreboot table at 0x00000000.
coreboot table found at 0x99b76000.
coreboot header(24) checksum: 80ab table(1196) checksum: e8d5 entries: 37
Vendor ID: Purism, part ID: Librem 14
Using Internal DMI decoder.
DMI string chassis-type: "Laptop"
Laptop detected via DMI.
DMI string system-manufacturer: "Purism"
DMI string system-product-name: "Librem 14"
DMI string system-version: "1.0"
DMI string baseboard-manufacturer: "Purism"
DMI string baseboard-product-name: "Librem 14"
DMI string baseboard-version: "1.0"
W836xx enter config mode worked or we were already in config mode. W836xx leave config mode had no effect.
Active config mode, unknown reg 0x20 ID: 85.
Found ITE EC, ID 0x8528, Rev 0x0a on port 0x2e.
WARNING: No chipset found. Flash detection will most likely fail.
Super I/O ID 0x8528 is not on the list of flash-capable controllers.
No board enable found matching coreboot IDs vendor="Purism", model="Librem 14".
========================================================================
You seem to be running flashrom on an unknown laptop. Some
internal buses have been disabled for safety reasons.

Laptops, notebooks and netbooks are difficult to support and we
recommend to use the vendor flashing utility. The embedded controller
(EC) in these machines often interacts badly with flashing.
See the manpage and https://flashrom.org/Laptops for details.

If flash is shared with the EC, erase is guaranteed to brick your laptop
and write may brick your laptop.
Read and probe may irritate your EC and cause fan failure, backlight
failure and sudden poweroff.
You have been warned.
========================================================================
Unhandled programmer parameters: ich_spi_mode=hwseq
Aborting.
Error: Programmer initialization failed.

Also, I tried to setup boot order using the script, got the same error. Any ideas what I’m doing wrong?