Panicking firmware / broken esptool updates ... any hope?

I had a working platformio / ESP32-S3 LILYGO T5 e paper configuration, updating the firmware with esptool. On the last successful update of the firmware, I messed up and now in Serial Monitor, I can see the code is panicking and in a cycle of constant reboots:

Start of setup
Guru Meditation Error: Core 1 panic’ed (StoreProhibited). Exception was unhandled.

Core 1 register dump:
PC : 0x400570e8 PS : 0x00060630 A0 : 0x82001878 A1 : 0x3fcebdf0
A2 : 0x00000000 A3 : 0xffffffff A4 : 0x0003f480 A5 : 0x00000000
A6 : 0x02c945e0 A7 : 0x00003f48 A8 : 0x8200182c A9 : 0x3fcebd70
A10 : 0x00000003 A11 : 0x00000003 A12 : 0x00000003 A13 : 0x000003e5
A14 : 0x3fcebdbc A15 : 0x000f4240 SAR : 0x00000000 EXCCAUSE: 0x0000001d
EXCVADDR: 0x00000000 LBEG : 0x400570e8 LEND : 0x400570f3 LCOUNT : 0x00003f47

Backtrace: 0x400570e5:0x3fcebdf0 |<-CORRUPTED

ELF file SHA256: 240928e468cd81e4

Build:Mar 27 2021
rst:0xc (RTC_SW_CPU_RST),boot:0x2f (SPI_FAST_FLASH_BOOT)
Saved PC:0x420216c2
mode:DIO, clock div:1
entry 0x403c98d4

My challenge now though is that if I try to upload new firmware… esptool isn’t happy:

Retrieving maximum program size .pio\build\lilygo-t-display-s3\firmware.elf
Checking size .pio\build\lilygo-t-display-s3\firmware.elf
Advanced Memory Usage is available via “PlatformIO Home > Project Inspect”
RAM: [= ] 5.7% (used 18720 bytes from 327680 bytes)
Flash: [ ] 3.8% (used 248645 bytes from 6553600 bytes)
Configuring upload protocol…
AVAILABLE: cmsis-dap, esp-bridge, esp-builtin, esp-prog, espota, esptool, iot-bus-jtag, jlink, minimodule, olimex-arm-usb-ocd, olimex-arm-usb-ocd-h, olimex-arm-usb-tiny-h, olimex-jtag-tiny, tumpa
CURRENT: upload_protocol = esptool
Looking for upload port…
Auto-detected: COM12
Uploading .pio\build\lilygo-t-display-s3\firmware.bin v4.5.1
Serial port COM12

A serial exception error occurred: Write timeout

My thinking is that the broken code running on the esp32 is rebooting, whilst esptool is trying to update the firmware. If I hold down the reset button, on the LILYGO and wait 'till platformio is trying to upload… I can get a little further:

Looking for upload port…
Auto-detected: COM12
Uploading .pio\build\lilygo-t-display-s3\firmware.bin v4.5.1
Serial port COM12
Chip is ESP32-S3 (revision v0.1)
Features: WiFi, BLE
Crystal is 40MHz
MAC: 34:85:18:70:4e:a0
Uploading stub…
Running stub…
Stub running…
Changing baud rate to 460800

A fatal error occurred: No serial data received.
*** [upload] Error 2

Anyone got any suggestions on how I can get out of this hole I have dug for myself!

Can’t you put the board into bootloader mode directly by connecting GPIO0 to GND and pressing reset once (or power cycling the device with that connection made)?

Max, Thanks! I see the board has buttons for exactly that. Thanks for taking the time to cover a newbie error. I am back up and running.