сделал загрузку обновленной прошивки и само обновление раздельными

static/main.html

@@ -629,7 +629,8 @@
                     <input type="file" accept="application/zip" @change="(e) => { this.uploadFw.filename = e.target.files[0] }">
                     <span v-if="uploadFw.sha256 !== null">SHA256: {{ uploadFw.sha256 }}</span>
                 </label>
-                <button class="dangerous-button" @click="settingsUploadUpdate()">Обновить встроенное ПО <span class="submit-spinner" v-show="submitStatus.firmwareUpload"></span></button>
+                <button class="action-button" @click="settingsUploadUpdate()">Загрузить<span class="submit-spinner" v-show="submitStatus.firmwareUpload"></span></button>
+                <button class="dangerous-button" v-show="uploadFw.sha256 !== null" @click="settingsPerformFirmwareUpgrade()">Обновить встроенное ПО <span class="submit-spinner" v-show="submitStatus.firmwareUpgrade"></span></button>
             </div>
 
             <div hidden>
@@ -808,6 +809,7 @@
                 debugSend: false,
                 tcpAccel: false,
                 firmwareUpload: false,
+                firmwareUpgrade: false
             },
 
             stat_rx: {
@@ -1312,14 +1314,14 @@
 
                 try {
                     this.submitStatus.firmwareUpload = true
+                    this.uploadFw.progress = 0
                     const blob = await readFileAsArrayBuffer(this.uploadFw.filename)
 
                     const xhr = new XMLHttpRequest();
-                    const success = await new Promise((resolve) => {
+                    await new Promise((resolve) => {
                         xhr.upload.addEventListener("progress", (event) => {
                             if (event.lengthComputable) {
                                 this.uploadFw.progress = Math.round((event.loaded / event.total) * 1000) / 10;
-                                console.log("upload progress:", this.uploadFw.progress);
                             }
                         });
                         xhr.addEventListener("loadend", () => {
@@ -1332,23 +1334,23 @@
                         xhr.setRequestHeader("Content-Type", "application/octet-stream");
                         xhr.send(blob);
                     });
-                    console.log("success:", success);
-                    // const result = await fetch('', {
-                    //     method: 'POST',
-                    //     body: await readFileAsArrayBuffer(this.uploadFw.filename),
-                    //     headers: {
-                    //         'Content-Type': 'application/zip',
-                    //     },
-                    //     onuploadprogress: (progressEvent) => {
-                    //         this.uploadFw.progress = Math.round((progressEvent.loaded / progressEvent.total) * 100);
-                    //     },
-                    // })
                 } catch (e) {
                     alert(`Ошибка загрузки файла: ${e}`);
                 }
                 this.submitStatus.firmwareUpload = false
             },
 
+            async settingsPerformFirmwareUpgrade() {
+                if (this.submitStatus.firmwareUpgrade) { return }
+                this.submitStatus.firmwareUpgrade = true
+                try {
+                    await fetch('/api/doFirmwareUpgrade', { method: 'POST' })
+                } catch (e) {
+                    console.log("failed to perform upgrade firmware: ", e)
+                }
+                this.submitStatus.firmwareUpgrade = false
+            },
+
             performUpdateSettings(reloadParts) {
                 const doFetchSettings = async () => {
                     let d = await fetch("/api/get/settings")