diff --git a/dependencies/user-cgcreate.sh b/dependencies/user-cgcreate.sh
index c460443..b214759 100755
--- a/dependencies/user-cgcreate.sh
+++ b/dependencies/user-cgcreate.sh
@@ -35,9 +35,12 @@ if [ "$max_swap_kbytes" != "" ] && [ ! ${#max_swap_kbytes} -eq 0 ] && [ "$max_sw
     ! instance_swap_kbytes=$(expr $instance_mem_kbytes + $max_swap_kbytes / $max_instance_count) && echo "Max swap memory limit calculation error." && exit 1
 fi
 
-instance_cpu_us=0
+instance_cpu_quota=0
+# In the Sashimono configuration, CPU time is 1000000us Sashimono is given max_cpu_us out of it.
+# Instance allocation is multiplied by number of cores to determined the number of cores per instance and devided by 10 since cfs_period_us is set to 100000us
 if [ "$max_cpu_us" != "" ] && [ ! ${#max_cpu_us} -eq 0 ] && [ "$max_cpu_us" -gt 0 ]; then
-    ! instance_cpu_us=$(expr $max_cpu_us / $max_instance_count) && echo "Max cpu limit calculation error." && exit 1
+    cores=$(grep -c ^processor /proc/cpuinfo)
+    ! instance_cpu_quota=$(expr $(expr $cores \* $max_cpu_us) / $(expr $max_instance_count \* 10)) && echo "Max cpu limit calculation error." && exit 1
 fi
 
 prefix="sashi"
@@ -53,18 +56,18 @@ done
 has_err=0
 for user in "${validusers[@]}"; do
     # Setup user cgroup.
-    if  [ $instance_cpu_us -gt 0 ] &&
+    if [ $instance_cpu_quota -gt 0 ] &&
         ! (cgcreate -g cpu:$user$cgroupsuffix &&
-        echo "1000000" > /sys/fs/cgroup/cpu/$user$cgroupsuffix/cpu.cfs_period_us &&
-        echo "$instance_cpu_us" > /sys/fs/cgroup/cpu/$user$cgroupsuffix/cpu.cfs_quota_us); then
+            echo "100000" >/sys/fs/cgroup/cpu/$user$cgroupsuffix/cpu.cfs_period_us &&
+            echo "$instance_cpu_quota" >/sys/fs/cgroup/cpu/$user$cgroupsuffix/cpu.cfs_quota_us); then
         echo "CPU cgroup creation for $user failed."
         has_err=1
     fi
 
     if [ $instance_mem_kbytes -gt 0 ] &&
         ! (cgcreate -g memory:$user$cgroupsuffix &&
-        echo "${instance_mem_kbytes}K" > /sys/fs/cgroup/memory/$user$cgroupsuffix/memory.limit_in_bytes &&
-        echo "${instance_swap_kbytes}K" > /sys/fs/cgroup/memory/$user$cgroupsuffix/memory.memsw.limit_in_bytes); then
+            echo "${instance_mem_kbytes}K" >/sys/fs/cgroup/memory/$user$cgroupsuffix/memory.limit_in_bytes &&
+            echo "${instance_swap_kbytes}K" >/sys/fs/cgroup/memory/$user$cgroupsuffix/memory.memsw.limit_in_bytes); then
         echo "Memory cgroup creation for $user failed."
         has_err=1
     fi
diff --git a/dependencies/user-install.sh b/dependencies/user-install.sh
index 13661bc..8073b20 100755
--- a/dependencies/user-install.sh
+++ b/dependencies/user-install.sh
@@ -209,10 +209,14 @@ WantedBy=default.target" >"$user_dir"/.config/systemd/user/ledger_fs.service
 
 sudo -u "$user" XDG_RUNTIME_DIR="$user_runtime_dir" systemctl --user daemon-reload
 
+# In the Sashimono configuration, CPU time is 1000000us Sashimono is given max_cpu_us out of it.
+# Instance allocation is multiplied by number of cores to determined the number of cores per instance and devided by 10 since cfs_period_us is set to 100000us
+cores=$(grep -c ^processor /proc/cpuinfo)
+cpu_quota=$(expr $(expr $cores \* $cpu) / 10)
 echo "Setting up user cgroup resources."
 ! (cgcreate -g cpu:$user$cgroupsuffix &&
-    echo "1000000" >/sys/fs/cgroup/cpu/$user$cgroupsuffix/cpu.cfs_period_us &&
-    echo "$cpu" >/sys/fs/cgroup/cpu/$user$cgroupsuffix/cpu.cfs_quota_us) && rollback "CGROUP_CPU_CREAT"
+    echo "100000" >/sys/fs/cgroup/cpu/$user$cgroupsuffix/cpu.cfs_period_us &&
+    echo "$cpu_quota" >/sys/fs/cgroup/cpu/$user$cgroupsuffix/cpu.cfs_quota_us) && rollback "CGROUP_CPU_CREAT"
 ! (cgcreate -g memory:$user$cgroupsuffix &&
     echo "${memory}K" >/sys/fs/cgroup/memory/$user$cgroupsuffix/memory.limit_in_bytes &&
     echo "${swapmem}K" >/sys/fs/cgroup/memory/$user$cgroupsuffix/memory.memsw.limit_in_bytes) && rollback "CGROUP_MEM_CREAT"
diff --git a/installer/prereq.sh b/installer/prereq.sh
index 36f7ec9..23c8980 100755
--- a/installer/prereq.sh
+++ b/installer/prereq.sh
@@ -48,11 +48,17 @@ else
     fi
 fi
 
+# Install iptables
+if ! command -v iptables &>/dev/null; then
+    stage "Installing iptables"
+    apt-get install -y iptables
+fi
+
 # Load br_netfilter kernel module on startup (if not loaded already).
 if [[ -z "$(lsmod | grep br_netfilter)" ]]; then
     echo "Adding br_netfilter"
     modprobe br_netfilter
-    echo "br_netfilter" > /etc/modules-load.d/br_netfilter.conf
+    echo "br_netfilter" >/etc/modules-load.d/br_netfilter.conf
 fi
 
 # -------------------------------
@@ -92,10 +98,10 @@ if [ $updated -eq 1 ]; then
     # Create a backup of original, if remount failed replace updated with backup.
     cp $originalfstab $backup
     mv "$tmpfstab" $originalfstab
-    if ! mount -o remount / 2>&1 ; then
+    if ! mount -o remount / 2>&1; then
         mv $backup $originalfstab
         echo "Re mounting error." && exit 1
-    fi 
+    fi
     echo "Updated fstab."
 else
     echo "fstab already configured."
@@ -134,7 +140,7 @@ if [ $res -eq 0 ]; then
         res=$?
         updated=1
     elif [ $res -eq 0 ]; then
-        echo "user_allow_other" >> "$tmpconf"
+        echo "user_allow_other" >>"$tmpconf"
         res=$?
         updated=1
     fi
@@ -236,7 +242,7 @@ if [ $res -eq 100 ]; then
         fi
     fi
 elif [ $res -eq 0 ]; then
-    echo "GRUB_CMDLINE_LINUX=\"cgroup_enable=memory swapaccount=1\"" >> "$tmpgrub"
+    echo "GRUB_CMDLINE_LINUX=\"cgroup_enable=memory swapaccount=1\"" >>"$tmpgrub"
     res=$?
     updated=1
 fi
@@ -251,7 +257,7 @@ if [ $updated -eq 1 ]; then
     cp /etc/default/grub $grub_backup
     mv "$tmpgrub" /etc/default/grub
     rm -r "$tmp"
-    if ! update-grub >/dev/null 2>&1 ; then
+    if ! update-grub >/dev/null 2>&1; then
         mv $grub_backup /etc/default/grub
         echo "Grub update failed."
         exit 1
@@ -268,4 +274,4 @@ else
     echo "Grub already configured."
 fi
 
-exit 0
\ No newline at end of file
+exit 0
diff --git a/mb-xrpl/lib/appenv.js b/mb-xrpl/lib/appenv.js
index 05e9fef..892c212 100644
--- a/mb-xrpl/lib/appenv.js
+++ b/mb-xrpl/lib/appenv.js
@@ -20,7 +20,7 @@ appenv = {
     ACQUIRE_LEASE_TIMEOUT_THRESHOLD: 0.8,
     ACQUIRE_LEASE_WAIT_TIMEOUT_THRESHOLD: 0.4,
     SASHI_CLI_PATH: appenv.IS_DEV_MODE ? "../build/sashi" : "/usr/bin/sashi",
-    MB_VERSION: '0.5.2',
+    MB_VERSION: '0.5.3',
     TOS_HASH: '757A0237B44D8B2BBB04AE2BAD5813858E0AECD2F0B217075E27E0630BA74314' // This is the sha256 hash of TOS text.
 }
 Object.freeze(appenv);
diff --git a/mb-xrpl/lib/message-board.js b/mb-xrpl/lib/message-board.js
index 3e7374f..13e11a5 100644
--- a/mb-xrpl/lib/message-board.js
+++ b/mb-xrpl/lib/message-board.js
@@ -107,14 +107,15 @@ class MessageBoard {
                         console.log(`Moments exceeded (current ledger:${e.ledger_index}, expiry ledger:${x.expiryLedger}). Destroying ${x.containerName}`);
                         // Expire the current lease agreement (Burn the instance NFT) and re-minting and creating sell offer for the same lease index.
                         const nft = (await (new evernode.XrplAccount(x.tenant)).getNfts())?.find(n => n.NFTokenID == x.containerName);
+                        // If there's no nft for this record it should be already burned and instance is destroyed, So we only delete the record.
                         if (!nft)
-                            throw `Cannot find a NFT for ${x.containerName}`;
+                            console.log(`Cannot find a NFT for ${x.containerName}`);
+                        else {
+                            const uriInfo = evernode.UtilHelpers.decodeLeaseNftUri(nft.URI);
+                            await this.destroyInstance(x.containerName, x.tenant, uriInfo.leaseIndex, true);
+                        }
 
-                        const uriInfo = evernode.UtilHelpers.decodeLeaseNftUri(nft.URI);
-                        await this.destroyInstance(x.containerName, x.tenant, uriInfo.leaseIndex, true);
                         this.activeInstanceCount--;
-                        await this.hostClient.updateRegInfo(this.activeInstanceCount);
-
                         /**
                          * Soft deletion for debugging purpose.
                          */
@@ -122,6 +123,8 @@ class MessageBoard {
 
                         // Delete the lease record related to this instance (Permanent Delete).
                         await this.deleteLeaseRecord(x.txHash);
+
+                        await this.hostClient.updateRegInfo(this.activeInstanceCount);
                         console.log(`Destroyed ${x.containerName}`);
                     }
                     catch (e) {
diff --git a/src/version.hpp b/src/version.hpp
index b20e904..3bbe61a 100644
--- a/src/version.hpp
+++ b/src/version.hpp
@@ -6,7 +6,7 @@
 namespace version
 {
     // Sashimono agent version. Written to new configs.
-    constexpr const char *AGENT_VERSION = "0.5.2";
+    constexpr const char *AGENT_VERSION = "0.5.3";
 
     // Minimum compatible config version (this will be used to validate configs).
     constexpr const char *MIN_CONFIG_VERSION = "0.5.0";