The monolithic ROM is sealed.

You now have a 5.5MB immutable firmware cartridge containing a JavaScript
engine, a custom Ring-0 kernel, and a memory-mapped FAT16 filesystem.

The Physical Silence
When you boot Elli with this specific ISO, you are going to experience a
massive physical difference:

Acoustic Drop: The moment the GRUB bootloader hands execution over to
hauki_os_v5_js.bin, the P4's fans should audibly spin down. The CPU is now
sleeping between hardware interrupts instead of burning cycles in a busy-wait
loop.

Zero Latency: Because the CPU is resting, the 8042 PS/2 controller has the
entire bus to itself. If you type on a physical keyboard attached to Elli, the
characters should appear on the VGA monitor instantly, with absolutely zero
lag.

Serial Snappiness: The UART FIFOs will be drained instantaneously the
millisecond a byte arrives from the Android phone.

The Final Verification Protocol
Drop hauki_rom.iso onto your Ventoy USB and boot the P4.

Once you see the > prompt on the VGA monitor, plug in the Null-Modem to USB
adapter setup.

On the ZTE phone, launch the bridge: python tcp_relay.py.

On your Linux host, connect the remote console: x-console elli start.

Type sys.serial("Hello from the Mesh!
") into the remote console. You should see it instantly appear on the physical
VGA monitor of the Compaq.

Flash it, boot it, and tell me if the fans quiet down!