买了个平板准备搞SDR一体机，贪便宜买了山寨。看着是Android13系统，实际上是Android 8.1（adb下载提示SDK 27不兼容就开始怀疑了）这是机子真实配置（50报废机价买的，也不亏） [upl-image-preview uuid=969db812-1b39-4501-a383-96aa540e9a5e url=https://storage.hamcq.cn/2025-10-07/1759835778-672440-0130ca3453cb85e8d46bb643f923bf57.jpg alt={TEXT?}] 另外真实闪存容量是32G，还好没相信标的1TB（1024GB整就发现不对劲，而且1T什么价位心里都清楚）已经试过ApktoolM快速修改，打开直接停止运行试过走刷机路线，解了BL，但是找不到合适的ROM，SP FLASH报错UNSUPPORTED_CTRL_CODE，折腾半天最后放弃。最终的希望寄托在SDR++软件上，我尝试导入Android Studio自行降级，但是以前没有做过Android项目（甚至Gradle也没碰过几下），一直搞不好，卡在项目同步 Gradle是我自己下载的Gradle 9.1.0，在C盘放着 [upl-image-preview uuid=63ef9f52-e14f-484f-8840-b0d6e31601c5 url=https://storage.hamcq.cn/2025-10-07/1759836076-539459-image.png alt={TEXT?}] [upl-image-preview uuid=4d5c1c41-a67b-4f9b-bd0e-afae46f70ce7 url=https://storage.hamcq.cn/2025-10-07/1759836093-735753-image.png alt={TEXT?}] [upl-image-preview uuid=3abd9b80-3480-4956-84ce-652c60bcaf1b url=https://storage.hamcq.cn/2025-10-07/1759836115-352005-image.png alt={TEXT?}] [upl-image-preview uuid=f1e30f27-245f-412f-ae87-35ffc3997991 url=https://storage.hamcq.cn/2025-10-07/1759836168-330399-image.png alt={TEXT?}] 项目地址: https://github.com/sannysanoff/SDRPlusPlusBrown

@"BI1XJT"#p81335 高手出自ham中，非常感谢大佬，sdr++已经跑起来了。这台山寨机也没有任何遗憾[upl-image-preview uuid=5ebd2735-d5a0-44e3-828b-5d682dae64ff url=https://storage.hamcq.cn/2025-10-08/1759889446-611937-screenshot-2025-10-08-10-10-35-908-commiuigallery.jpg alt={TEXT?}]

[upl-image-preview uuid=f72bf33b-b66e-4f2a-a13d-cb329fb07675 url=https://storage.hamcq.cn/2025-10-08/1759891566-445846-screenshot-2025-10-08-10-45-45-870-commiuigallery.jpg alt={TEXT?}] [upl-image-preview uuid=ed893f6c-5d72-49d6-bf3d-ec83968efbea url=https://storage.hamcq.cn/2025-10-08/1759891566-709667-screenshot-2025-10-08-10-45-52-271-commiuigallery.jpg alt={TEXT?}] 我已经找到山寨机的造假工具，并且把参数改回原配置启动方式： adb shell am start -n com.shcy.select/SelectActicity

路过，膜拜一下两位大佬

I need help from someone who develops for Android to downgrade the compilation of SDR++Brown, or provide guidance.

BD6JYO

I bought a tablet with the intention of building an SDR all-in-one device, but I ended up buying a cheap, fake one.
The system appears to be Android 13, but in reality, it's Android 8.1 (I started to suspect when the adb download prompt indicated that SDK 27 is incompatible).
This is the actual configuration of the machine (I bought a used machine for 50, and it's still worth it).

Additionally, the actual flash memory capacity is 32G. Fortunately, I didn't fall for the claim of 1TB (1024GB), which was clearly incorrect, and I also knew that a 1TB product wouldn't be priced that low.
I have already tried using ApktoolM for quick modification, but it didn't work; the application simply stopped running.

I tried using the "flash directly" method, which resolved the BL issue, but I couldn't find a suitable ROM. The SP Flash tool reported an error: "UNSUPPORTED\_CTRL\_CODE". After spending a lot of time trying different things, I eventually gave up.

My final hope rests on the SDR++ software. I tried to downgrade Android Studio myself, but I had never worked on an Android project before (and hadn't even touched Gradle), so I kept running into problems and getting stuck during synchronization.

I downloaded Gradle 9.1.0 myself and it's located on my C drive.

Project address: https://github.com/sannysanoff/SDRPlusPlusBrown

BI1XJT

TODO

BI1XJT

构建成功了，源代码有几行调用了 Oreo 不存在的 API。看起来是音频相关的，不知道影不影响使用，我做了一些更改（diff 如下）：

diff --git a/sink_modules/android_audio_sink/src/main.cpp b/sink_modules/android_audio_sink/src/main.cpp
index 9162988..58576b9 100644
--- a/sink_modules/android_audio_sink/src/main.cpp
+++ b/sink_modules/android_audio_sink/src/main.cpp
@@ -316,6 +316,8 @@ private:
             if (isBtSco) {
                 backend::startBtSco();
             }
+
+           #if __ANDROID_API__ >= 28
             if (false && isBtSco) {
                 AAudioStreamBuilder_setInputPreset(builder,
                                                    AAUDIO_INPUT_PRESET_VOICE_COMMUNICATION);
@@ -328,6 +330,8 @@ private:
                                                        AAUDIO_INPUT_PRESET_VOICE_COMMUNICATION);
                 }
             }
+           #endif
+
             auto deviceId = sources[selectedSourceIndex].enumId;
             if (deviceId != -1) {
                 AAudioStreamBuilder_setDeviceId(builder, deviceId);
@@ -699,4 +703,4 @@ MOD_EXPORT void _DELETE_INSTANCE_(void* instance) {
 MOD_EXPORT void _END_() {
     config.disableAutoSave();
     config.save();
-}
\ No newline at end of file
+}

Debug 构建：https://rad1o.cn/files/sdrpp-brown-oreo-debug.apk
Release 构建：https://rad1o.cn/files/sdrpp-brown-oreo-release.apk
（我也不知道哪个版本能用，所以…… 都试试吧）

73 & GL,
BI1XJT

BD6JYO

BI1XJT The expert information came from ham radio, thank you very much to the senior user. SDR++ has been successfully running.
This fake device has no regrets.

BD6JYO

I have found the tools used to counterfeit the devices, and I have reverted the parameters back to their original configuration.
Startup method:
adb shell am start -n com.shcy.select/SelectActivity

BG5VLI

As I passed by, I wanted to show my respect to these two prominent figures.

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