diff --git a/README.md b/README.md
index 8980077..2e79537 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Before building the sphinx-key esp software, run this:
 
 Find the path to your `riscv32-esp-elf-gcc` binary within the `.embuild` dir:
 
-`export CC=$PWD/.embuild/espressif/tools/riscv32-esp-elf/esp-2021r2-8.4.0/riscv32-esp-elf/bin/riscv32-esp-elf-gcc`
+`export CC=$PWD/.embuild/espressif/tools/riscv32-esp-elf/esp-2021r2-patch3-8.4.0/riscv32-esp-elf/bin/riscv32-esp-elf-gcc`
 
 ### build test
 
diff --git a/persister/src/persist_fs.rs b/persister/src/persist_fs.rs
index f25b95e..13d0aea 100644
--- a/persister/src/persist_fs.rs
+++ b/persister/src/persist_fs.rs
@@ -1,19 +1,15 @@
 use fsdb::{Bucket, DoubleBucket, Fsdb};
-use lightning_signer::persist::Persist;
-use lightning_signer_server::persist::model::{ChannelEntry, NodeEntry};
-use std::string::String;
-
 use lightning_signer::bitcoin::secp256k1::PublicKey;
 use lightning_signer::chain::tracker::ChainTracker;
-use lightning_signer::channel::Channel;
-use lightning_signer::channel::ChannelId;
-use lightning_signer::channel::ChannelStub;
+use lightning_signer::channel::{Channel, ChannelId, ChannelStub};
 use lightning_signer::monitor::ChainMonitor;
 use lightning_signer::node::NodeConfig;
+use lightning_signer::persist::Persist;
 use lightning_signer::policy::validator::EnforcementState;
-use lightning_signer_server::persist::model::AllowlistItemEntry;
-use lightning_signer_server::persist::model::ChainTrackerEntry;
-use lightning_signer_server::persist::model::NodeChannelId;
+use lightning_signer_server::persist::model::{
+    AllowlistItemEntry, ChainTrackerEntry, ChannelEntry, NodeEntry,
+};
+use std::string::String;
 
 use lightning_signer::persist::model::{
     ChannelEntry as CoreChannelEntry, NodeEntry as CoreNodeEntry,
@@ -44,8 +40,8 @@ impl FsPersister {
 }
 
 fn get_channel_key(channel_id: &[u8]) -> &[u8] {
-        let length = channel_id.len();
-        channel_id.get(length-11..length-7).unwrap()
+    let length = channel_id.len();
+    channel_id.get(length - 11..length - 7).unwrap()
 }
 
 impl Persist for FsPersister {
diff --git a/signer/src/lib.rs b/signer/src/lib.rs
index 0d665c3..9b60eb5 100644
--- a/signer/src/lib.rs
+++ b/signer/src/lib.rs
@@ -1,5 +1,4 @@
-use lightning_signer::persist::{DummyPersister, Persist};
-// use lightning_signer::Arc;
+use lightning_signer::persist::Persist;
 use std::sync::Arc;
 use vls_protocol::model::PubKey;
 use vls_protocol::msgs::{self, read_serial_request_header, write_serial_response_header, Message};