diff --git a/src/client_server/sync.rs b/src/client_server/sync.rs
index c57f1da1..7d3af6ba 100644
--- a/src/client_server/sync.rs
+++ b/src/client_server/sync.rs
@@ -89,7 +89,9 @@ pub async fn sync_events_route(
 
     let we_have_to_wait = rx.borrow().is_none();
     if we_have_to_wait {
-        let _ = rx.changed().await;
+        if let Err(e) = rx.changed().await {
+            error!("Error waiting for sync: {}", e);
+        }
     }
 
     let result = match rx
diff --git a/src/client_server/to_device.rs b/src/client_server/to_device.rs
index 3bb135e7..9faa2555 100644
--- a/src/client_server/to_device.rs
+++ b/src/client_server/to_device.rs
@@ -19,7 +19,9 @@ pub async fn send_event_to_device_route(
     let sender_user = body.sender_user.as_ref().expect("user is authenticated");
     let sender_device = body.sender_device.as_deref();
 
+    // TODO: uncomment when https://github.com/vector-im/element-android/issues/3589 is solved
     // Check if this is a new transaction id
+    /*
     if db
         .transaction_ids
         .existing_txnid(sender_user, sender_device, &body.txn_id)?
@@ -27,6 +29,7 @@ pub async fn send_event_to_device_route(
     {
         return Ok(send_event_to_device::Response.into());
     }
+    */
 
     for (target_user_id, map) in &body.messages {
         for (target_device_id_maybe, event) in map {
diff --git a/src/database/abstraction/sled.rs b/src/database/abstraction/sled.rs
index 271be1e9..e58184df 100644
--- a/src/database/abstraction/sled.rs
+++ b/src/database/abstraction/sled.rs
@@ -64,7 +64,7 @@ impl Tree for SledEngineTree {
         backwards: bool,
     ) -> Box<dyn Iterator<Item = (Vec<u8>, Vec<u8>)> + Send> {
         let iter = if backwards {
-            self.0.range(..from)
+            self.0.range(..=from)
         } else {
             self.0.range(from..)
         };
diff --git a/src/database/rooms.rs b/src/database/rooms.rs
index 4d66f9f1..af0761ff 100644
--- a/src/database/rooms.rs
+++ b/src/database/rooms.rs
@@ -1495,7 +1495,7 @@ impl Rooms {
         prefix.push(0xff);
 
         let mut current = prefix.clone();
-        current.extend_from_slice(&until.to_be_bytes());
+        current.extend_from_slice(&(until.saturating_sub(1)).to_be_bytes()); // -1 because we don't want event at `until`
 
         let current: &[u8] = &current;
 
diff --git a/src/database/users.rs b/src/database/users.rs
index f99084fa..1480d3fa 100644
--- a/src/database/users.rs
+++ b/src/database/users.rs
@@ -726,10 +726,9 @@ impl Users {
         json.insert("sender".to_owned(), sender.to_string().into());
         json.insert("content".to_owned(), content);
 
-        self.todeviceid_events.insert(
-            &key,
-            &serde_json::to_vec(&json).expect("Map::to_vec always works"),
-        )?;
+        let value = serde_json::to_vec(&json).expect("Map::to_vec always works");
+
+        self.todeviceid_events.insert(&key, &value)?;
 
         Ok(())
     }
@@ -774,7 +773,7 @@ impl Users {
 
         for (key, _) in self
             .todeviceid_events
-            .iter_from(&last, true)
+            .iter_from(&last, true) // this includes last
             .take_while(move |(k, _)| k.starts_with(&prefix))
             .map(|(key, _)| {
                 Ok::<_, Error>((