diff --git a/.gitignore b/.gitignore
index 75fd41e..e6b83ef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 credentials.*
 
 # This project unique files and folders
+build
 Images
 Research Materials
 release-meta.json
diff --git a/Makefile b/Makefile
index b8ebad5..6233ea6 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ CONFIG ?= src/config.h
 CREDENTIALS ?= src/credentials.h
 SKETCH ?= src/src.ino
 LIBRARIES_PATH ?= libraries
-ARDUINO_BOARD ?= esp32:esp32:XIAO_ESP32C3
+ARDUINO_BOARD ?= esp32:esp32:XIAO_ESP32C3:UploadSpeed=230400,CDCOnBoot=default,CPUFreq=160,FlashFreq=80,FlashMode=qio,FlashSize=4M,PartitionScheme=min_spiffs,DebugLevel=debug,EraseFlash=none
 ARDUINO_CLI_CONFIG ?= tools/arduino-cli/arduino-cli.yaml
 RELEASE_DIR ?= build
 RELEASE_META ?= $(RELEASE_DIR)/release-meta.json
diff --git a/build/firmware_42PRAGUEAPI_SCREEN_v.4.39.bin b/build/firmware_42PRAGUEAPI_SCREEN_v.4.39.bin
deleted file mode 100644
index 21800fa..0000000
Binary files a/build/firmware_42PRAGUEAPI_SCREEN_v.4.39.bin and /dev/null differ
diff --git a/build/src.ino.bin b/build/src.ino.bin
deleted file mode 100644
index 3275c21..0000000
Binary files a/build/src.ino.bin and /dev/null differ
diff --git a/build/src.ino.bootloader.bin b/build/src.ino.bootloader.bin
deleted file mode 100644
index 8d855ec..0000000
Binary files a/build/src.ino.bootloader.bin and /dev/null differ
diff --git a/build/src.ino.merged.bin b/build/src.ino.merged.bin
deleted file mode 100644
index 0a94e8f..0000000
Binary files a/build/src.ino.merged.bin and /dev/null differ
diff --git a/build/src.ino.partitions.bin b/build/src.ino.partitions.bin
deleted file mode 100644
index 21800fa..0000000
Binary files a/build/src.ino.partitions.bin and /dev/null differ
diff --git a/tools/arduino-cli/arduino-cli.yaml b/tools/arduino-cli/arduino-cli.yaml
index 86a9c7d..e6bcb53 100644
--- a/tools/arduino-cli/arduino-cli.yaml
+++ b/tools/arduino-cli/arduino-cli.yaml
@@ -1,3 +1,5 @@
+# This file configures Arduino CLI itself.
+# Board-specific build menu options are pinned in the Makefile FQBN.
 board_manager:
   additional_urls:
     - https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json