diff --git a/build.sh b/build.sh
index 313c4c47..0810682a 100755
--- a/build.sh
+++ b/build.sh
@@ -1,3 +1,6 @@
+# cache project config json for use in get_platform_for_env()
+PIO_CONFIG_JSON=$(pio project config --json-output)
+
 #!/usr/bin/env bash
 
 global_usage() {
@@ -64,9 +67,6 @@ case $1 in
     ;;
 esac
 
-# cache project config json for use in get_platform_for_env()
-PIO_CONFIG_JSON=$(pio project config --json-output)
-
 # $1 should be the string to find (case insensitive)
 get_pio_envs_containing_string() {
   shopt -s nocasematch
@@ -93,19 +93,20 @@ get_pio_envs_ending_with_string() {
 # $1 should be the environment name
 get_platform_for_env() {
   local env_name=$1
-  echo "$PIO_CONFIG_JSON" | python3 -c "
+  printf '%s' "$PIO_CONFIG_JSON" | python3 -c "
 import sys, json, re
-data = json.load(sys.stdin)
+raw = sys.stdin.read()
+data = json.loads(raw, strict=False)
 for section, options in data:
     if section == 'env:$env_name':
         for key, value in options:
             if key == 'build_flags':
                 for flag in value:
-                    match = re.search(r'(ESP32_PLATFORM|NRF52_PLATFORM|STM32_PLATFORM|RP2040_PLATFORM)', flag)
+                    match = re.search(r'(ESP32_PLATFORM|NRF52_PLATFORM|STM32_PLATFORM|RP2040_PLATFORM)', str(flag))
                     if match:
                         print(match.group(1))
                         sys.exit(0)
-"
+" 2>/dev/null || true
 }
 
 # disable all debug logging flags if DISABLE_DEBUG=1 is set
@@ -149,31 +150,20 @@ build_firmware() {
   # build firmware target
   pio run -e $1
 
-  # build merge-bin for esp32 fresh install, copy .bins to out folder (e.g: Heltec_v3_room_server-v1.0.0-SHA.bin)
-  if [ "$ENV_PLATFORM" == "ESP32_PLATFORM" ]; then
-    pio run -t mergebin -e $1
-    cp .pio/build/$1/firmware.bin out/${FIRMWARE_FILENAME}.bin 2>/dev/null || true
-    cp .pio/build/$1/firmware-merged.bin out/${FIRMWARE_FILENAME}-merged.bin 2>/dev/null || true
+  # Build merged binaries where supported (ESP32 targets).
+  pio run -t mergebin -e $1 >/dev/null 2>&1 || true
+
+  # Generate UF2 from HEX when useful and UF2 is not already present.
+  if [ -f ".pio/build/$1/firmware.hex" ] && [ ! -f ".pio/build/$1/firmware.uf2" ]; then
+    python3 bin/uf2conv/uf2conv.py .pio/build/$1/firmware.hex -c -o .pio/build/$1/firmware.uf2 -f 0xADA52840 >/dev/null 2>&1 || true
   fi
 
-  # build .uf2 for nrf52 boards, copy .uf2 and .zip to out folder (e.g: RAK_4631_Repeater-v1.0.0-SHA.uf2)
-  if [ "$ENV_PLATFORM" == "NRF52_PLATFORM" ]; then
-    python3 bin/uf2conv/uf2conv.py .pio/build/$1/firmware.hex -c -o .pio/build/$1/firmware.uf2 -f 0xADA52840
-    cp .pio/build/$1/firmware.uf2 out/${FIRMWARE_FILENAME}.uf2 2>/dev/null || true
-    cp .pio/build/$1/firmware.zip out/${FIRMWARE_FILENAME}.zip 2>/dev/null || true
-  fi
-
-  # for stm32, copy .bin and .hex to out folder
-  if [ "$ENV_PLATFORM" == "STM32_PLATFORM" ]; then
-    cp .pio/build/$1/firmware.bin out/${FIRMWARE_FILENAME}.bin 2>/dev/null || true
-    cp .pio/build/$1/firmware.hex out/${FIRMWARE_FILENAME}.hex 2>/dev/null || true
-  fi
-
-  # for rp2040, copy .bin and .uf2 to out folder
-  if [ "$ENV_PLATFORM" == "RP2040_PLATFORM" ]; then
-    cp .pio/build/$1/firmware.bin out/${FIRMWARE_FILENAME}.bin 2>/dev/null || true
-    cp .pio/build/$1/firmware.uf2 out/${FIRMWARE_FILENAME}.uf2 2>/dev/null || true
-  fi
+  # Copy any produced artifacts to out folder.
+  cp .pio/build/$1/firmware.bin out/${FIRMWARE_FILENAME}.bin 2>/dev/null || true
+  cp .pio/build/$1/firmware-merged.bin out/${FIRMWARE_FILENAME}-merged.bin 2>/dev/null || true
+  cp .pio/build/$1/firmware.hex out/${FIRMWARE_FILENAME}.hex 2>/dev/null || true
+  cp .pio/build/$1/firmware.uf2 out/${FIRMWARE_FILENAME}.uf2 2>/dev/null || true
+  cp .pio/build/$1/firmware.zip out/${FIRMWARE_FILENAME}.zip 2>/dev/null || true
 
 }