Starting with Stock BTT-Config and Old Configs as Backup

ini/teensy.ini

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+#
+# Marlin Firmware
+# PlatformIO Configuration File
+#
+
+#################################
+#                               #
+#     Teensy Architectures      #
+#                               #
+#################################
+
+#
+# Teensy++ 2.0
+#
+[env:teensy20]
+platform   = teensy
+extends    = common_avr8
+board      = teensy2pp
+lib_ignore = ${env:common_avr8.lib_ignore}, NativeEthernet
+
+#
+# Teensy 3.1 / 3.2 (ARM Cortex-M4)
+#
+[env:teensy31]
+platform      = teensy@~4.12.0
+board         = teensy31
+src_filter    = ${common.default_src_filter} +<src/HAL/TEENSY31_32>
+lib_ignore    = NativeEthernet
+
+#
+# Teensy 3.5 / 3.6 (ARM Cortex-M4)
+#
+[env:teensy35]
+platform      = teensy@~4.12.0
+board         = teensy35
+src_filter    = ${common.default_src_filter} +<src/HAL/TEENSY35_36>
+lib_ignore    = NativeEthernet
+
+[env:teensy36]
+platform      = teensy@~4.12.0
+board         = teensy36
+src_filter    = ${common.default_src_filter} +<src/HAL/TEENSY35_36>
+lib_ignore    = NativeEthernet
+
+#
+# Teensy 4.0 / 4.1 (ARM Cortex-M7)
+#
+[env:teensy41]
+platform      = teensy@~4.12.0
+board         = teensy41
+src_filter    = ${common.default_src_filter} +<src/HAL/TEENSY40_41>