diff --git a/README.md b/README.md
index 508ca31..1ef9175 100644
--- a/README.md
+++ b/README.md
@@ -2,20 +2,16 @@
 
 A Lightning Hardware Wallet based on [Validating Lightning Signer](https://gitlab.com/lightning-signer/validating-lightning-signer)
 
-### set CFLAGS
+### build factory
 
-Before building the sphinx-key esp software, run this:
+`cd factory`
 
-`export CFLAGS=-fno-pic`
-
-### find your esp GCC 
-
-Find the path to your `riscv32-esp-elf-gcc` binary within the `.embuild` dir:
-
-`export CC=$PWD/.embuild/espressif/tools/riscv32-esp-elf/esp-2021r2-patch3-8.4.0/riscv32-esp-elf/bin/riscv32-esp-elf-gcc`
+`cargo build --release`
 
 ### build
 
+`cd ../sphinx-key`
+
 The wifi SSID and password needs to be in env to build the firmware. SSID must be at least 6 characters, and PASS must be at least 8 characters.
 
 `SSID=sphinx-1 PASS=sphinx-1234 cargo build`
diff --git a/factory/.cargo/config.toml b/factory/.cargo/config.toml
index 33f5399..548a46d 100644
--- a/factory/.cargo/config.toml
+++ b/factory/.cargo/config.toml
@@ -1,8 +1,4 @@
 [build]
-# Uncomment the relevant target for your chip here (ESP32, ESP32-S2, ESP32-S3 or ESP32-C3)
-#target = "xtensa-esp32-espidf"
-#target = "xtensa-esp32s2-espidf"
-#target = "xtensa-esp32s3-espidf"
 target = "riscv32imc-esp-espidf"
 
 [target.xtensa-esp32-espidf]
@@ -29,6 +25,6 @@ build-std-features = ["panic_immediate_abort"] # Required for older ESP-IDF vers
 [env]
 # Note: these variables are not used when using pio builder
 # Enables the esp-idf-sys "native" build feature (`cargo build --features native`) to build against ESP-IDF stable (v4.4)
-ESP_IDF_VERSION = { value = "release/v4.4" }
+ESP_IDF_VERSION = { value = "tag:v4.4.2" }
 # Enables the esp-idf-sys "native" build feature (`cargo build --features native`) to build against ESP-IDF master (mainline)
 #ESP_IDF_VERSION = { value = "master" }
diff --git a/sphinx-key/.cargo/config.toml b/sphinx-key/.cargo/config.toml
index 564686d..6d4c078 100644
--- a/sphinx-key/.cargo/config.toml
+++ b/sphinx-key/.cargo/config.toml
@@ -29,8 +29,8 @@ build-std-features = ["panic_immediate_abort"] # Required for older ESP-IDF vers
 [env]
 # Note: these variables are not used when using pio builder
 # Enables the esp-idf-sys "native" build feature (`cargo build --features native`) to build against ESP-IDF stable (v4.4)
-ESP_IDF_VERSION = { value = "release/v4.4" }
+ESP_IDF_VERSION = { value = "tag:v4.4.2" }
 # Enables the esp-idf-sys "native" build feature (`cargo build --features native`) to build against ESP-IDF master (mainline)
 #ESP_IDF_VERSION = { value = "master" }
-CC = { value = "../factory/.embuild/espressif/tools/riscv32-esp-elf/esp-2021r2-patch4-8.4.0/riscv32-esp-elf/bin/riscv32-esp-elf-gcc", relative = true }
+CC = { value = "../factory/.embuild/espressif/tools/riscv32-esp-elf/esp-2021r2-patch3-8.4.0/riscv32-esp-elf/bin/riscv32-esp-elf-gcc", relative = true }
 CFLAGS = { value = "-fno-pic" }
diff --git a/sphinx-key/Cargo.lock b/sphinx-key/Cargo.lock
index 0ed5ee9..47ff1be 100644
--- a/sphinx-key/Cargo.lock
+++ b/sphinx-key/Cargo.lock
@@ -1885,9 +1885,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.85"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e55a28e3aaef9d5ce0506d0a14dbba8054ddc7e499ef522dd8b26859ec9d4a44"
+checksum = "41feea4228a6f1cd09ec7a3593a682276702cd67b5273544757dae23c096f074"
 dependencies = [
  "itoa",
  "ryu",
@@ -1989,13 +1989,14 @@ dependencies = [
 
 [[package]]
 name = "sphinx-glyph"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf0527b300544e9fe193611f1be1f76e3b25f5ceab4217347429c2912b60093e"
+checksum = "dbab7d4a5119f6040006784cee5117aabf8654588620e58a01b66732bb307671"
 dependencies = [
  "anyhow",
  "rmp-serde",
  "serde",
+ "serde_json",
  "sphinx-auther",
 ]