diff --git a/src/auto/backdoor.js b/src/auto/backdoor.js
index 7699a6c..e12f91a 100644
--- a/src/auto/backdoor.js
+++ b/src/auto/backdoor.js
@@ -1,4 +1,4 @@
-import { getServerTree } from "/lib/ServerTree.js"
+import { getServerTree } from "../lib/ServerTree.js"
 
 /** @param {NS} ns */
 export async function main(ns) {
@@ -26,7 +26,7 @@ export async function main(ns) {
 
 	// 2nd pass: walk the tree and backdoor servers
 	const backdoor = async (subtree) => {
-		if (!subtree.info.backdoorInstalled) {
+		if (!subtree.info.backdoorInstalled && subtree.info.requiredHackingSkill <= ns.getHackingLevel()) {
 			ns.tprintf("backdoor %s, do not change server", subtree.info.hostname)
 			await ns.singularity.installBackdoor()
 			ns.tprint("backdoor complete")
diff --git a/src/lib/ServerTree.js b/src/lib/ServerTree.js
index a422cdb..8f623a2 100644
--- a/src/lib/ServerTree.js
+++ b/src/lib/ServerTree.js
@@ -1,5 +1,11 @@
 /** @param {NS} ns */
-const importantHosts = ["CSEC", "avmnite-02h", "I.I.I.I", "run4theh111z", "w0r1d_d43m0n"]
+export const IMPORTANT_HOST = [
+	"CSEC",
+	"avmnite-02h",
+	"I.I.I.I",
+	"run4theh111z",
+	"w0r1d_d43m0n"
+]
 
 class ServerTreeNode {
 	constructor(ns, serverName) {
@@ -28,7 +34,7 @@ class ServerTreeNode {
 		}
 		this.ns.tprintf(
 			"%s %s %s %4s   %s",
-			importantHosts.includes(this.serverName) ? "!" : " ",
+			IMPORTANT_HOST.includes(this.serverName) ? "!" : " ",
 			this.info.hasAdminRights ? "Y" : "N",
 			this.info.openPortCount,
 			this.info.requiredHackingSkill,
diff --git a/src/map.js b/src/map.js
index d1c2387..2478e20 100644
--- a/src/map.js
+++ b/src/map.js
@@ -1,4 +1,4 @@
-import {getServerTree} from '/lib/ServerTree.js'
+import {getServerTree} from './lib/ServerTree.js'
 
 /** @param {NS} ns */
 export async function main(ns) {