diff --git a/c/set-protocol/ports/android/README.md b/c/set-protocol/ports/android/README.md
index 65424f8..73616aa 100644
--- a/c/set-protocol/ports/android/README.md
+++ b/c/set-protocol/ports/android/README.md
@@ -13,3 +13,9 @@ the Android adapter for protocol operations; the portable protocol core remains
 workspace, up to 2×16384 doubles). `trends/SpectrumAnalyzer` maps timestamps and
 errors but does not duplicate FFT/filter math. Run it off the UI thread.
 `trends/PlotViewport` is a toolkit-free normalized zoom/pan model.
+
+`kotlin/ru/setcorp/setprotocol/update/FirmwareCatalog.kt` is a UI-independent
+firmware release client. It reads the optional `firmware.releases` array from
+the shared `update.json`, accepts only HTTPS assets, limits their size and
+returns image bytes only after SHA-256 verification. Applications provide
+their own UI and pass optional HTTP Basic credentials.
diff --git a/c/set-protocol/ports/android/kotlin/ru/setcorp/setprotocol/update/FirmwareCatalog.kt b/c/set-protocol/ports/android/kotlin/ru/setcorp/setprotocol/update/FirmwareCatalog.kt
new file mode 100644
index 0000000..ffdb56c
--- /dev/null
+++ b/c/set-protocol/ports/android/kotlin/ru/setcorp/setprotocol/update/FirmwareCatalog.kt
@@ -0,0 +1,170 @@
+package ru.setcorp.setprotocol.update
+
+import android.util.Base64
+import org.json.JSONObject
+import java.net.HttpURLConnection
+import java.net.URL
+import java.security.MessageDigest
+
+/** Учётные данные HTTP Basic для закрытого каталога релизов. */
+data class FirmwareCatalogCredentials(val login: String, val password: String)
+
+/** Одна проверенная запись секции `firmware.releases` общего update.json. */
+data class FirmwareRelease(
+    val product: String,
+    val versionName: String,
+    val versionCode: Long,
+    val imageUrl: String,
+    val fileName: String,
+    val sha256: String,
+    val notes: String,
+    val transport: String,
+    val baseAddress: Long?,
+)
+
+/**
+ * Переиспользуемый клиент базы прошивок для Android-приложений SET.
+ *
+ * Не зависит от UI: читает общий manifest, валидирует записи, загружает образ
+ * только по HTTPS и возвращает байты после обязательной проверки SHA-256.
+ */
+class FirmwareCatalogClient(private val userAgent: String) {
+    fun readCatalog(manifestUrl: String, credentials: FirmwareCatalogCredentials?): List<FirmwareRelease> {
+        val connection = openChecked(URL(manifestUrl), "application/json", credentials)
+        val text = try {
+            connection.inputStream.bufferedReader().use { reader ->
+                reader.readText().also {
+                    require(it.length <= MAX_MANIFEST_CHARS) { "Файл каталога прошивок слишком большой" }
+                }
+            }
+        } finally {
+            connection.disconnect()
+        }
+        return parse(manifestUrl, text)
+    }
+
+    fun download(
+        release: FirmwareRelease,
+        credentials: FirmwareCatalogCredentials?,
+        onProgress: (Float) -> Unit = {},
+    ): ByteArray {
+        val connection = openChecked(URL(release.imageUrl), "application/octet-stream", credentials)
+        val total = connection.contentLengthLong
+        require(total < 0 || total <= MAX_FIRMWARE_BYTES) { "Файл прошивки превышает допустимый размер" }
+        return try {
+            val bytes = connection.inputStream.use { input ->
+                val output = java.io.ByteArrayOutputStream()
+                val buffer = ByteArray(DEFAULT_BUFFER_SIZE)
+                var received = 0L
+                while (true) {
+                    val count = input.read(buffer)
+                    if (count < 0) break
+                    received += count
+                    require(received <= MAX_FIRMWARE_BYTES) { "Файл прошивки превышает допустимый размер" }
+                    output.write(buffer, 0, count)
+                    if (total > 0) onProgress((received.toFloat() / total).coerceIn(0f, 1f))
+                }
+                output.toByteArray()
+            }
+            require(bytes.isNotEmpty()) { "Сервер вернул пустой файл прошивки" }
+            val actual = MessageDigest.getInstance("SHA-256").digest(bytes).toHex()
+            require(actual.equals(release.sha256, ignoreCase = true)) {
+                "SHA-256 загруженной прошивки не совпадает с каталогом"
+            }
+            onProgress(1f)
+            bytes
+        } finally {
+            connection.disconnect()
+        }
+    }
+
+    private fun openChecked(
+        initial: URL,
+        accept: String,
+        credentials: FirmwareCatalogCredentials?,
+    ): HttpURLConnection {
+        var current = initial.requireHttps()
+        val credentialHost = current.host
+        for (redirect in 0..MAX_REDIRECTS) {
+            val connection = current.openConnection() as HttpURLConnection
+            connection.connectTimeout = CONNECT_TIMEOUT_MS
+            connection.readTimeout = READ_TIMEOUT_MS
+            connection.instanceFollowRedirects = false
+            connection.setRequestProperty("Accept", accept)
+            connection.setRequestProperty("User-Agent", userAgent)
+            if (credentials != null && current.host.equals(credentialHost, ignoreCase = true)) {
+                val basic = Base64.encodeToString(
+                    "${credentials.login}:${credentials.password}".toByteArray(), Base64.NO_WRAP,
+                )
+                connection.setRequestProperty("Authorization", "Basic $basic")
+            }
+            val code = connection.responseCode
+            if (code in REDIRECT_CODES) {
+                val location = connection.getHeaderField("Location")
+                    ?: run { connection.disconnect(); error("Перенаправление без адреса") }
+                connection.disconnect()
+                require(redirect < MAX_REDIRECTS) { "Слишком много перенаправлений" }
+                current = URL(current, location).requireHttps()
+                continue
+            }
+            if (code !in 200..299) {
+                connection.disconnect()
+                error("Сервер каталога прошивок вернул HTTP $code")
+            }
+            return connection
+        }
+        error("Слишком много перенаправлений")
+    }
+
+    companion object {
+        fun parse(manifestUrl: String, text: String): List<FirmwareRelease> {
+            require(text.length <= MAX_MANIFEST_CHARS) { "Файл каталога прошивок слишком большой" }
+            val root = JSONObject(text)
+            val firmware = root.optJSONObject("firmware")
+                ?: error("В update.json не опубликован каталог прошивок")
+            val rows = firmware.optJSONArray("releases")
+                ?: error("В каталоге отсутствует массив releases")
+            return buildList {
+                for (index in 0 until rows.length()) {
+                    val row = rows.getJSONObject(index)
+                    val product = row.optString("product", row.optString("device")).trim()
+                    val versionName = row.optString("versionName", row.optString("version")).trim()
+                    val versionCode = row.optLong("versionCode", -1)
+                    val imageUrl = URL(URL(manifestUrl), row.getString("imageUrl")).toString()
+                    URL(imageUrl).requireHttps()
+                    val sha256 = row.getString("sha256").trim().lowercase()
+                    val fileName = row.optString("fileName", URL(imageUrl).path.substringAfterLast('/')).trim()
+                    val transport = row.optString("transport", "rs485").trim().lowercase()
+                    require(product.isNotEmpty() && versionName.isNotEmpty() && versionCode >= 0) {
+                        "Не заполнены обязательные поля прошивки №${index + 1}"
+                    }
+                    require(sha256.matches(Regex("[0-9a-f]{64}"))) { "Некорректный SHA-256 прошивки №${index + 1}" }
+                    require(fileName.matches(Regex("[A-Za-zА-Яа-яЁё0-9._ -]+\\.(bin|hex)", RegexOption.IGNORE_CASE))) {
+                        "Некорректное имя файла прошивки №${index + 1}"
+                    }
+                    require(transport in setOf("rs485", "can", "stm32")) { "Некорректный канал прошивки №${index + 1}" }
+                    val baseAddress = row.opt("baseAddress")?.takeUnless { it == JSONObject.NULL }?.toString()?.let(::parseAddress)
+                    add(FirmwareRelease(
+                        product, versionName, versionCode, imageUrl, fileName, sha256,
+                        row.optString("notes").trim(), transport, baseAddress,
+                    ))
+                }
+            }.sortedWith(compareBy<FirmwareRelease> { it.product.lowercase() }.thenByDescending { it.versionCode })
+        }
+
+        private fun parseAddress(value: String): Long =
+            if (value.startsWith("0x", ignoreCase = true)) value.drop(2).toLong(16) else value.toLong()
+
+        private fun URL.requireHttps(): URL = also {
+            require(protocol.equals("https", ignoreCase = true)) { "Обновления разрешены только по HTTPS" }
+        }
+
+        private fun ByteArray.toHex(): String = joinToString("") { "%02x".format(it) }
+        private const val CONNECT_TIMEOUT_MS = 15_000
+        private const val READ_TIMEOUT_MS = 60_000
+        private const val MAX_REDIRECTS = 5
+        private const val MAX_MANIFEST_CHARS = 128 * 1024
+        private const val MAX_FIRMWARE_BYTES = 128L * 1024 * 1024
+        private val REDIRECT_CODES = setOf(301, 302, 303, 307, 308)
+    }
+}